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orchid any of numerous mostly tropical plants that bear blossoms of various and exotic colors and shapes. [3 definitions]
orchil any of several lichens that yield purple or reddish dyes. [2 definitions]
orchis any of a genus of orchids bearing small purple or white flowers that grow in spikes.
orcinol a white crystalline compound that turns red on exposure to air, used as a reagent for certain carbohydrates.
ordain to proclaim or authorize (a person) to be a Christian priest or minister, or a rabbi, esp. by a formal ceremony. [4 definitions]
ordeal a painful, exhausting, or emotionally trying experience, esp. when regarded as a test of a person's endurance or character. [2 definitions]
order a direction or command. [16 definitions]
orderable combined form of order.
orderless combined form of order.
orderly characterized by a neat and methodical arrangement. [5 definitions]
Order of the Garter the highest order of British knighthood.
ordinal of a particular position in a numbered order. [3 definitions]
ordinal number any number that is used to express order in a series, such as first, second, or tenth. (Cf. cardinal number.)
ordinance a regulation, law, decree, or rule, esp. one issued by a city or town.
ordinarily as a rule; usually. [2 definitions]
ordinary usual or normal. [5 definitions]
ordinate the distance of a point from the horizontal axis of a graph as measured parallel to the vertical axis. (Cf. abscissa.)
ordination the act or ceremony of ordaining or the state of being ordained.
ordnance military weapons and their attendant supplies and equipment. [2 definitions]
Ordovician of, relating to, or designating the geological period between the Cambrian and Silurian of the Paleozoic Era, from approximately 500 million to 440 million years ago, when marine invertebrate animals were abundant. [2 definitions]
ordure solid excrement; dung.