The name of the letter O, used in English in exclamations, direct address, and poetic apostrophe.
O'KaneAn Irish surname, an anglicized form of Ó Catháin.
O'odhamAn Indigenous Uto-Aztecan people of southern Arizona and northern Sonora, and the language they speak.
OahuThe third-largest island in Hawaii, home to Honolulu and the majority of the state’s population.
OakA large tree of the beech family with lobed leaves and acorns, valued for its hard wood.
OarA long pole with a flat blade used to row or steer a boat.
OatA cereal plant cultivated for its edible grains, commonly used as food for humans and livestock.
OathA solemn promise, often invoking a divine witness, regarding one's future action or behavior.
OathboundBound or obligated by an oath or promise.
OathbreakerA person who breaks a sworn promise or oath.
OathkeeperA person who keeps or honors an oath.
OathswornBound or pledged by a solemn oath, especially to a person, cause, or code.
OaxacaA state in southern Mexico, and its capital city, known for its Indigenous cultures and rich regional history.
ObadiahA biblical Hebrew name meaning “servant of Yahweh,” borne by several figures in the Hebrew Bible.
ObdormitionThe state of being asleep or in a deep sleep.
ObductionThe action of drawing over or covering something.
ObdurateStubbornly refusing to change one’s opinion or course of action.
ObedientWilling to comply with authority, rules, or instructions.
ObeliaA genus of colonial hydrozoans, often forming delicate branching marine colonies.
ObelionA point on the skull near the posterior fontanelle, used in craniometry.