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oil well a well from which petroleum is drawn or pumped.
oily of or like oil. [2 definitions]
ointment a soft, oily substance made to be rubbed into the skin. Ointment may be used as medicine or to soften the skin.
Ojibwa a member of an American Indian people living around Lake Superior in the United States and Canada.
OK1 (informal) all right; satisfactory. [5 definitions]
OK2 an abbreviation for Oklahoma.
okay another spelling of OK.
Oklahoma a state in the southwestern United States. Its capital is Oklahoma City. (abbreviated: OK)
okra a green vegetable that is shaped like a tube. Okra becomes sticky when cooked and is used in soups or fried. [2 definitions]
old having lived for many years; not young. [5 definitions]
olden of or having to do with ancient times.
Old English the English language as it was spoken from about 450 to about 1400.
old-fashioned looking or being like past styles, manners, or ways of behaving. [2 definitions]
Old Testament the Christian name for the writings that make up the first major part of the Bible. The Old Testament is also part of the Hebrew scriptures.
Old World the Eastern Hemisphere, which includes Europe, Asia, Australia, and Africa.
oleomargarine a food like butter made from vegetable oil instead of milk; margarine.
olive a small green or black fruit with a pit. Olives are eaten raw or used to make olive oil. [4 definitions]
olive oil oil pressed from ripe olives. Olive oil is used for cooking.
Olympic of or relating to the Olympic Games.
Olympus a mountain in northern Greece, believed in ancient times to be the place where the gods lived; Mount Olympus.
Oman a country on the Indian Ocean northeast of Yemen and east of Saudi Arabia. The capital of Oman is Muscat.