English words starting with O

Containing no oil; not using or requiring oil.

The economic sector concerned with the exploration, extraction, refining, transportation, and marketing of petroleum and natural gas.

a picture painted using oil paints

The cost of a barrel or other unit of crude oil or petroleum products on the market.

(of a surface, especially canvas for painting) having been prepared or coated with a layer of oil-based primer.

Engaged in or involved with the extraction and production of petroleum.

Connected with or involving oil, especially petroleum.

containing or producing large amounts of oil, especially petroleum

A fine-grained sedimentary rock containing kerogen, from which liquid hydrocarbons can be extracted.

Thoroughly saturated or drenched with oil.

An accidental release of liquid petroleum into the environment, especially the sea, due to human activity.

Marked or soiled with oil.

A deep hole or shaft drilled into the earth to obtain petroleum or crude oil.

A fabric, typically cotton, that has been treated with oil or a synthetic substance to make it waterproof.

Covered or treated with oil.

a worker or device that applies oil, especially to machinery.

the quality or state of being oily, greasy, or unpleasantly smooth and ingratiating in manner.

a man who owns or operates an oil well or who sells oil.

A seed from which oil is extracted, such as rapeseed, sunflower seed, or cottonseed.

cloth, typically cotton, treated with oil to make it waterproof.

covered with or containing oil; greasy.

the characteristic grunting sound made by a pig.

A smooth, thick substance that is put on the skin to heal wounds or soreness.

Satisfactory or acceptable.

a large, short-necked, browsing mammal of the central african rainforest, having a dark chestnut coat with stripes on the hindquarters and upper legs.

acceptable, satisfactory, or allowed

Satisfactory; acceptable.

An informal, light-hearted, or humorous way of saying "yes" or "okay" to indicate agreement or acceptance.

Relating to Okinawa, its people, or their culture or language.

a tall plant with long green seed cases that are eaten as a vegetable

An informal greeting, especially in Hawaiian or Spanish contexts.

Having lived or existed for a long time; not young or new.

Relating to or characteristic of old age or elderly people.

The country of one's birth or ancestry, especially when one now lives in a different country.

Relating to or characteristic of traditional industries, such as manufacturing and heavy industry, as opposed to newer technology-based sectors.

Belonging to or typical of a style or method from the past; no longer modern or fashionable.

(of a forest or trees) having been in existence for a very long time and having a complex ecological structure, relatively untouched by human activity.

The original or long-standing members of a group, especially those who are conservative and resistant to change.

A polite or formal term for an elderly woman.

Following traditional, established, and often conservative methods or principles.

Having an appearance that suggests age or being old-fashioned.

An elderly man.

Wealth that has been inherited through several generations of a family, often associated with established social status and traditional, discreet habits.

Following or preferring traditional ideas, styles, or methods, often in a way that is seen as out of date.

Characteristic of or resembling a style, fashion, or method from an earlier period; not modern.

belonging to or characteristic of the past; old-fashioned or traditional.

a person who has been in a particular place, job, or activity for a very long time.

relating to or characteristic of the old world, especially Europe, in contrast to the Americas

Belonging to a period in the distant past; ancient or former.

an old song, film, or television programme that is still well known or popular

the state or quality of being old

An old person, especially one who is considered to be elderly or advanced in years.

Containing, producing, or resembling oil; greasy.

a poisonous evergreen shrub of the dogbane family, with clusters of white, pink, or red flowers.

Any of a series of unsaturated hydrocarbons containing a double bond, such as ethylene.

A spread made from vegetable oils, used as a substitute for butter; margarine.

The action or capacity of smelling; the sense of smell.

Relating to the sense of smell.

A very rich person who has a lot of influence in politics, especially in a country where a small group of such people control wealth and power.

Relating to or characterized by oligarchy; governed by or favoring a small group of people having control.

A form of government in which a small group of people holds all the power.

a short nucleic acid polymer, typically composed of up to a few dozen nucleotides, often used in genetic research, diagnostics, and therapeutics.

Relating to or characteristic of an oligopoly, a market structure in which a small number of firms control the supply of a particular product or service and can influence prices.

a state of limited competition in which a market is controlled by a small number of producers or sellers.

a small, oval fruit with a hard stone, green when unripe and black when ripe, used for food and for its oil

having a color like that of an unripe olive; a dull yellowish-green.

of a dull olive-brown or olive-green colour, as used in some military uniforms.

Having a yellowish-green colour like that of an unripe olive.

A pale yellow or green oil obtained by pressing olives, used in cooking and on salads.

Having a skin tone with a yellowish or light brownish hue, often associated with people from Mediterranean, Middle Eastern, or Latin American regions.

A green, brown, or yellow mineral consisting of magnesium iron silicate, found in igneous and metamorphic rocks.

a major international competition in a particular sport, especially the modern olympic games.

relating to Mount Olympus in Greece, or to the Greek gods

Relating to the ancient Olympic Games or the modern international Olympic Games.

Of a very large size; extremely large.

having the standard dimensions of a pool used for olympic competition

A major international sports competition held every four years, featuring summer or winter sports events in which athletes from many countries participate.

Of or relating to Oman, its people, or their culture.

an official whose job is to examine and report on complaints made by ordinary people about companies, government departments, or public organizations.

The 24th and last letter of the Greek alphabet (Ω, ω)

A dish made of beaten eggs cooked in a flat pan, often folded around a filling of cheese, vegetables, or meat.

A dish made of beaten eggs cooked in a flat pan, often folded around a filling of cheese, vegetables, or meat.

An event or object believed to be a sign of future good or bad luck.

a code of silence that forbids speaking about criminal activities, especially to the authorities, originating within the Mafia and other criminal organizations.

The 15th letter of the Greek alphabet (Ο, ο)

suggesting that something bad is going to happen in the future

In a way that suggests that something bad is going to happen

The act of not including something or someone; something that has been left out or not done.

To leave out or fail to include something, either deliberately or by mistake.

to leave out or exclude (someone or something), either intentionally or forgetfully

A volume containing several works previously published separately.

Receiving signals or transmitting in all directions.

the state or quality of having unlimited or very great power.

Having unlimited or very great power; all-powerful.

the state of being present everywhere at the same time, especially as an attribute of a deity.

present everywhere at the same time.

The state of knowing everything.

knowing everything

an animal or person that eats both plants and meat.

Eating both plants and animals

used to show position on the surface of something

Currently being broadcast on radio or television.

Not continuous or regular; intermittent.

Located on or being part of a vehicle, ship, or aircraft

Available to provide a service or to work if needed, especially outside of normal working hours.

Happening or done while being filmed or recorded by a television or movie camera.

Located, happening, or available within the grounds of a university or college.

Located on or integrated into a single microchip or semiconductor substrate.

Happening or performed during a course of study or training.

Taking place on or relating to the playing area of a sport, especially tennis or basketball.

Located or waiting on the main open floor of a ship or boat.

Available or provided only when required or requested.

Currently engaged in one's official work or responsibilities

Taking place or located on a farm

Taking place or existing on a sports field or in the area where a game is played.

Taking place on an ice rink or frozen surface

happening or existing at the actual place where something is set or occurs

Located, occurring, or taking place on a mountain or mountains.

operating or functioning by being either fully active or completely inactive, with no intermediate state.

A short road that allows vehicles to enter a highway or freeway.