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Dictionary Suite
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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).
Orwellian of, concerning, or resembling George Orwell, his work, or esp. the totalitarian regime portrayed in his novel 1984.
-ory having the function of; pertaining to; characterized by; causing. [2 definitions]
oryx any of various large antelopes of Africa and southwestern Asia that have long, straight horns and grayish coats with black markings.
orzo pasta resembling grains of rice.
Os symbol of the chemical element osmium.
os1 a bone.