English words starting with O

A piece of music written as an introduction to an opera or a long musical piece.

to turn over so that the bottom is on top

Turned over so that the top is now at the bottom

The act of turning something over or upside down.

the act of using something too much or more than is necessary

used too much or too often

The act of assigning an excessively high monetary value to something.

To put too high a value on something; to value something more than it is really worth.

(of an asset, currency, etc.) considered to have a higher price or value than is justified or realistic.

a general description or summary of a subject or situation.

To supply (land or plants) with more water than is natural or necessary.

Showing excessive confidence or pride; arrogant.

weighing more than is considered normal, healthy, or allowed

To defeat someone or something by using a lot of force.

Feeling or experiencing something very strongly, especially an emotion, to the point where it is difficult to cope or manage.

Very great in amount, intensity, or power; so strong as to be overpowering.

By an extremely large amount or to an extremely large degree.

To spend or survive the winter.

(of an animal, plant, or pathogen) spending the winter in a particular place or state.

to work too hard or too long

having been made to work too hard or for too long

To write on top of something so that the original writing is no longer visible or is replaced.

in a state of being extremely worried and nervous

Too enthusiastic or eager, especially in a way that is excessive or not appropriate.

Relating to or characteristic of the Roman poet Ovid or his works.

(of an animal) producing young by means of eggs which are hatched after they have been laid by the parent.

A tubular organ at the end of the abdomen in many female insects and some fish, used for depositing eggs.

having the shape of an egg

To produce and release an egg cell from an ovary.

The process of releasing a mature egg from an ovary during the menstrual cycle.

A small structure in a seed plant that develops into a seed after fertilization.

The female reproductive cell of an animal; an egg cell.

To need to pay or repay money to a person, bank, business, etc.

(of money) yet to be paid; due.

Because of; as a result of.

A bird of prey with a large head, large forward-facing eyes, a short hooked beak, and typically a loud call, most active at night.

a small or young owl.

resembling or characteristic of an owl, especially in appearing solemn, wise, or slow-moving.

in a manner that is wise, solemn, or resembles an owl, especially in appearance (e.g., wearing glasses) or demeanor.

belonging to or done by a particular person or thing

Relating to the price of a good or service itself, as opposed to the price of other goods.

(of a person) completely controlled by or obsessed with a particular thing or person.

A person who owns something.

(of a house or other building) constructed by the person who owns it, rather than by a professional contractor.

(of a house, apartment, etc.) lived in by the owner, not rented out to tenants

a person who both owns and runs a business, especially the driver of a vehicle who owns it and uses it for commercial purposes

the state or fact of owning something

A domesticated bovine animal kept for milk or meat; a cow or bull.

A salt or ester of oxalic acid.

A U-shaped bend in a river.

A simple cart pulled by an ox or oxen.

A city in southern England, famous for its university, one of the oldest and most prestigious in the world.

Having been educated at the University of Oxford, typically implying a high level of academic achievement and associated social prestige.

A substance that causes another substance to undergo oxidation, or that gains electrons in a chemical reaction.

An enzyme that promotes the transfer of a hydrogen atom to oxygen, thus catalyzing an oxidation reaction.

The process or result of oxidizing or being oxidized, especially a chemical reaction in which a substance combines with oxygen.

Relating to, involving, or causing oxidation.

a chemical compound of oxygen with another element or group.

To combine chemically with oxygen.

(of a substance) having combined with oxygen, resulting in a loss of electrons.

A substance that causes another substance to undergo oxidation, typically by providing oxygen or removing electrons.

causing a chemical reaction in which a substance combines with oxygen

The tail of an ox, especially when used as food, typically in soups or stews.

A powerful synthetic opioid painkiller derived from thebaine, an alkaloid of opium.

a chemical element that is a gas with no smell or colour, forms about 20% of the earth's atmosphere, and is necessary for most living things and for burning.

Describing something, especially a substance like hemoglobin in blood, that has the function of transporting oxygen.

Containing or having a low concentration of oxygen.

Containing a high proportion of oxygen.

Suffering from or experiencing a severe lack of oxygen.

To supply, treat, or mix with oxygen.

(of a substance) containing oxygen or having had oxygen added to it.

(present participle) To supply, combine, or treat with oxygen.

The process of combining or treating with oxygen; the process of oxygenating.

A figure of speech in which apparently contradictory terms appear in conjunction.

Containing or using words that seem to contradict each other, often in a way that is surprisingly true or insightful.

A hormone released by the pituitary gland that causes increased contraction of the uterus during labor and stimulates the ejection of milk into the ducts of the breasts.

An exclamation used to express annoyance, dismay, or to get someone's attention.

a large flat shellfish that can be eaten raw or cooked, and some types of which produce pearls inside their shells

A black-and-white wading bird with a long, strong red bill, found on coasts worldwide and feeding on shellfish.

a person who gathers, cultivates, or sells oysters.

a form of oxygen with a sharp smell, that is a blue gas and is found in a layer high in the earth's atmosphere, or is produced by electrical equipment

causing damage to the ozone layer in the earth's atmosphere

Causing damage to or depletion of the ozone layer.