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orangewood a hard, fine-grained wood obtained from orange trees.
orangutan a large, tree-dwelling ape of Borneo and Sumatra that has long arms and long, reddish brown hair.
orate to speak in a formal or pompous manner.
oration a formal, usu. long speech, esp. one given on an important occasion. [2 definitions]
orator a person who delivers a public speech, or one skilled at formal public speaking.
oratorical of, pertaining to, or characteristic of oratory or an orator. [2 definitions]
oratorio a musical composition for voices and orchestra without costumes or scenery, usu. dramatizing a biblical subject.
oratory1 the art of public speaking. [2 definitions]
oratory2 a small chapel or room for private worship or prayer.
orb a spherical body such as a globe or planet. [3 definitions]
orbicular shaped like an orb; spherical. [2 definitions]
orbit the curved path in which a planet, satellite, or spacecraft revolves about another body. [7 definitions]
orca see killer whale
orchard an area of land planted with fruit or nut trees. [2 definitions]
orchestra a group of musicians who play various instruments and perform together. [3 definitions]
orchestrate to write or arrange (music) to be played by an orchestra. [2 definitions]
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]