English words starting with H

A chemical element that is the lightest gas, has no color, taste, or smell, and combines with oxygen to form water.

A specific deep-red spectral line of hydrogen, with a wavelength of 656.28 nanometers, produced by an electron transition in the hydrogen atom.

Using or involving hydrogen as a fundamental component or source.

Using hydrogen as the source of power or energy.

(of an unsaturated fat or oil) combined with hydrogen, causing it to become more solid.

The process of adding hydrogen to a substance, especially to an unsaturated organic compound.

Relating to the study of water in the earth's crust, especially groundwater.

Relating to the scientific description and mapping of bodies of water, especially the oceans, seas, and coasts.

Relating to the scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

Relating to the scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

A scientist who studies the properties, distribution, and effects of water on the earth's surface and in the soil and underlying rocks.

The scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere.

A chemical reaction in which a compound is broken down by reaction with water.

(of a compound) having undergone a chemical reaction in which water causes the breaking of a bond in a molecule.

having a strong affinity for water; tending to dissolve in, mix with, or be wetted by water.

Having a strong dislike or fear of water.

A microphone designed to detect sound waves underwater.

A light, fast motorboat designed to skim over the surface of water.

Relating to or involving the method of growing plants in a nutrient solution without soil.

In a way that relates to or involves hydroponics, the method of growing plants without soil, using mineral nutrient solutions in water.

The process of growing plants in sand, gravel, or liquid, with added nutrients but without soil.

electricity that is generated using the energy of flowing or falling water.

An abnormal accumulation of serous fluid in a body cavity or in the tissues; edema.

A white crystalline compound used as a photographic developer and as a skin-lightening agent.

Relating to the pressure exerted by a fluid at rest, especially water.

The treatment of disease or injury by exercising in water or by applying water to the body, often using jets or different temperatures.

Relating to or produced by the action of heated water, especially within the earth's crust.

a chemical compound consisting of an element or radical combined with the hydroxide ion (oh⁻).

A complex phosphate of calcium that is the principal inorganic constituent of bone and tooth enamel.

a group containing one hydrogen atom and one oxygen atom bonded together, characteristic of alcohols and many other organic compounds.

A wild animal of Africa and Asia that looks like a large dog and eats the remains of dead animals.

conditions or practices that help to maintain health and prevent disease, especially through cleanliness.

clean and free from germs, promoting good health and preventing disease.

A specialist, especially a dental professional, who helps to clean teeth and gives advice on keeping them clean and healthy.

(of a substance) tending to absorb moisture from the air.

A membrane that partly closes the opening of the vagina and is usually broken when a person has sexual intercourse for the first time.

a religious song of praise to god or a god, especially one sung by christians in church.

a book containing hymns for use in a religious service.

a book containing hymns for use in religious worship.

Relating to or denoting a U-shaped bone in the neck which supports the tongue.

excited or exaggerated publicity or promotion.

very excited, nervous, or full of energy, especially because of something that is going to happen

very excited, nervous, or full of energy, especially because of something that is going to happen

Extremely excited, energetic, or nervous; overstimulated.

Relating to or characterized by a heightened, exaggerated, or more intense reality than normal, often associated with simulation or media representation.

Extremely alert and watchful, especially to detect potential danger or difficulty.

abnormally or extremely active

A condition of being abnormally or excessively active, often used to describe a behavioral state in children characterized by constant movement and lack of focus.

Abnormally acute or painful sensitivity to sound.

Relating to or using greater than normal pressure, especially of oxygen.

A way of speaking or writing that makes something sound better, more exciting, more dangerous, etc. than it really is, by using extreme language.

Relating to or marked by hyperbole; exaggerated.

In a way that uses or is like a hyperbole; in an exaggerated manner.

an abnormally high level of calcium in the blood.

an abnormally high level of calcium in the urine.

an abnormally high concentration of carbon dioxide in the blood.

A very high-performance, technologically advanced, and often extremely expensive supercar, typically pushing the boundaries of automotive engineering.

Having an abnormally high level of cholesterol in the blood.

An abnormally high level of cholesterol in the blood.

Extremely competitive; characterized by an intense, often excessive, drive to compete and win.

Excessively and unreasonably critical, especially of small faults.

An excess of blood in the vessels supplying an organ or other part of the body.

the excessive or forceful straightening of a joint beyond its normal range of motion.

(of a spectral line) split into several very closely spaced components.

A genus of flowering plants, commonly known as St. John's wort, typically having yellow flowers with numerous stamens.

a very high and typically accelerating rate of inflation, causing money to lose its value rapidly.

Relating to or characterized by hyperinflation; extremely high and typically accelerating inflation.

Showing or characterized by excessive or abnormally increased muscular movement or activity.

a word, phrase, or image in an electronic document that you can click on to move to a different part of the same document or to a different document or website.

a very large self-service store that sells a wide variety of goods, including groceries, clothing, and household items, typically located outside a town.

a computing system in which text, sound, video, etc. are linked together and can be accessed from any point, especially on the internet.

a condition in which the parathyroid glands produce too much parathyroid hormone, leading to high levels of calcium in the blood.

A condition in which patches of skin become darker in color than the normal surrounding skin, due to excess melanin production.

An abnormal increase in the number of cells in an organ or tissue, causing it to enlarge.

excessively or abnormally sensitive.

an extreme or excessive physical reaction to a substance that is not harmful to most people.

relating to speeds that are more than five times the speed of sound

a theoretical space of more than three dimensions, especially as used in science fiction for faster-than-light travel.

a medical condition in which a person has blood pressure that is permanently too high.

having or relating to high blood pressure

A system of storing and linking text, images, and other data in a computer, allowing users to move easily from one piece of information to another.

a condition in which the body's temperature is significantly elevated above the normal range, often as a result of external factors or failed thermoregulation.

A medical condition in which the thyroid gland is overactive and produces too much thyroid hormone, leading to an increased metabolic rate.

(of a solution) having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.

having undergone an excessive enlargement or growth of an organ or tissue.

the enlargement of an organ or tissue from the increase in size of its cells.

To breathe very quickly and deeply, often causing dizziness or tingling, usually because of anxiety or panic.

The act or process of breathing too quickly and deeply, causing an excessive loss of carbon dioxide from the blood, which can lead to dizziness, tingling, and sometimes fainting.

A short dash (-) used to join words or parts of words, or to show that a word has been divided at the end of a line.

to join words or syllables with a hyphen.

written with a hyphen between two or more words or parts of words.

the act or process of dividing a word with a hyphen.

a mental state like sleep in which a person's thoughts and actions can be influenced by someone else.

A person who treats people using hypnotherapy.

the use of hypnosis to treat physical or mental problems.

relating to or producing hypnosis

in a manner that causes a state of focused attention, reduced peripheral awareness, and heightened suggestibility, often resembling sleep.

the act of producing a state like sleep in a person in which they can be influenced to do or say things

a person who uses hypnosis, especially for therapeutic purposes or entertainment.

to produce a state like sleep in a person in which their thoughts and actions can be influenced by your suggestions

to produce a state of hypnosis in someone

A hypodermic needle or syringe.

designed to be unlikely to cause an allergic reaction.

An abnormally low level of calcium in the blood.

A salt or ester of hypochlorous acid, containing the anion ClO⁻, often used as a bleaching agent and disinfectant.

abnormal chronic anxiety about one's health, often with a mistaken belief of serious illness.

A person who is excessively and abnormally anxious about their health, often believing they are ill when they are not.

Excessively anxious about one's health, often with an unfounded belief of serious illness.

the practice of claiming to have moral standards or beliefs to which one's own behavior does not conform; pretense.

a person who pretends to have virtues, moral or religious beliefs, principles, etc., that they do not actually possess, especially a person whose actions belie their stated beliefs.

Behaving in a way that suggests one has higher standards or more noble beliefs than is the case.

in a manner characterized by behavior that contradicts what one claims to believe or feel; with pretense and insincerity.

Relating to the area immediately beneath the skin.

situated below or under the tongue

an abnormally low level of glucose in the blood.

relating to or suffering from an abnormally low level of glucose in the blood.

a mild form of mania, characterized by persistent and often elevated, expansive, or irritable mood, but not severe enough to cause significant social or occupational impairment.

Relating to or affected by a mild form of mania, characterized by persistent and often elevated, expansive, or irritable mood, but less severe than full mania.

Relating to or situated in the hypopharynx, the lower part of the pharynx.

The incomplete or underdevelopment of an organ or tissue.