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orrery a model of bodies in the solar system that can show their relative positions and motions by means of simple mechanical adjustments.
orris any of several European irises with fragrant rootstocks, esp. a white-flowered species yielding orrisroot.
orrisroot the fragrant root of any of several species of iris, used in making perfumes and cosmetics.
or so or about that many.
Orson Welles U.S. actor, screenwriter, producer, and critically acclaimed motion picture director who first gained national recognition for his role in the 1938 radio broadcast adaptation of H.G. Wells's novel, The War of the Worlds (b.1915--d.1985).
ortho- right; correct. [2 definitions]
orthocenter the point at which the three altitudes of a triangle intersect.
orthoclase a monoclinic feldspar that is a common constituent in igneous rock such as granite.
orthodontia see orthodontics.
orthodontics (used with a sing. verb) the branch of dentistry that deals with the correct alignment and position of teeth; orthodontia.
orthodontist a dentist who specializes in straightening teeth.
orthodox adhering to or in accordance with long-established religious beliefs, laws, and practices. [4 definitions]
Orthodox Eastern Church variant of Eastern Orthodox Church.
orthodoxy the condition or quality of being orthodox. [2 definitions]
orthoepy the study of pronunciation; phonology. [2 definitions]
orthography spelling, esp. according to established conventions or in a particular style. [2 definitions]
orthopedics (used with a sing. verb) the branch of medicine dealing with the skeletal system and its associated muscles and joints, esp. with the treatment of skeletal disorders in children.
orthopteran any of a large order of plant-eating insects, including crickets, grasshoppers, and cockroaches, that have hard leathery forewings and membranous hind wings.
orthorhombic of or denoting a pattern of crystallization embodying three mutually perpendicular axes of different lengths.
ortolan a small brown European bunting, sometimes eaten as a delicacy.
Orville and Wilbur Wright two U.S. brothers who invented the first powered flight (Orville, b.1871--d.1948; Wilbur, b.1867--d.1912).