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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.
Os symbol of the chemical element osmium.
os1 a bone.
os2 a mouth; opening; aperture.
Osage orange a small thorny tree of the mulberry family, native to the midwestern United States, that is often used in hedgerows. [2 definitions]
Osaka a large port city in southern Honshu, Japan.
Oscar see Academy Award. [2 definitions]
Óscar Romero El Salvadoran Roman Catholic priest who was assassinated in retaliation for his social and political activity; born Óscar Arnulfo Romero y Galdámez (b.1917--d.1980).
oscillate to swing steadily and repeatedly back and forth. [4 definitions]