11-letter words starting with o
- origination — to take its origin or rise; begin; start; arise: The practice originated during the Middle Ages.
- originative — having or characterized by the power of originating; creative.
- originators — Plural form of originator.
- orjonikidze — Ordzhonikidze (def 1).
- orland park — a town in NE Illinois.
- ornamentals — Plural form of ornamental.
- ornamenting — Present participle of ornament.
- ornamentist — a person who adorns or decorates, esp professionally
- ornithology — the branch of zoology that deals with birds.
- ornithopods — Plural form of ornithopod.
- ornithopter — a heavier-than-air craft designed to be propelled through the air by flapping wings.
- ornithosaur — an extinct flying reptile
- orphan drug — Pharmacology. a drug that remains undeveloped or untested or is otherwise neglected because of limited potential for commercial gain.
- orthoborate — (inorganic chemistry) Any anion derived from orthoboric acid; any salt containing this anion.
- orthocartan — (mathematics, tool) A system for symbolic mathematics, especially General Relativity, written by A. Krasinski of Warsaw in the early 1980s.
- orthocenter — the point of intersection of the three altitudes of a triangle.
- orthocentre — Point at which the perpendiculars from the angles of a triangle intersect.
- orthoclases — Plural form of orthoclase.
- orthodontal — the branch of dentistry dealing with the prevention and correction of irregular teeth, as by means of braces.
- orthodontia — orthodontics.
- orthodontic — Of, or relating to the dental speciality of orthodontics.
- orthodoxies — Plural form of orthodoxy.
- orthodromic — relating to orthodromy
- orthogenics — the treatment of mentally and emotionally disturbed children
- orthography — the art of writing words with the proper letters, according to accepted usage; correct spelling.
- orthohelium — (physics) Form of the helium atom in which the spins of the two electrons are parallel.
- orthometric — (crystallography) having axes at right angles.
- orthonormal — (of a system of functions) normal; normalized.
- orthopaedic — of or relating to orthopedics.
- orthopedics — (used with a singular verb) the medical specialty concerned with correction of deformities or functional impairments of the skeletal system, especially the extremities and the spine, and associated structures, as muscles and ligaments.
- orthopedist — (used with a singular verb) the medical specialty concerned with correction of deformities or functional impairments of the skeletal system, especially the extremities and the spine, and associated structures, as muscles and ligaments.
- orthophyric — of or relating to a texture in which the groundmass is characterized by closely packed, short, quadrilateral crystals of feldspar larger than those in a trachytic groundmass.
- orthopnoeic — difficult or painful breathing except in an erect sitting or standing position.
- orthopraxia — the correction of deformities; orthopedics.
- orthopteran — orthopterous.
- orthopteron — an orthopterous insect.
- orthoscopic — pertaining to, characterized by, or produced by normal vision.
- orthostates — orthostat.
- orthostatic — relating to or caused by erect posture.
- orthostichy — a vertical rank or row.
- orthotropic — Botany. noting, pertaining to, or exhibiting a mode of vertical growth.
- oscillating — Moving in a repeated back-and-forth motion.
- oscillation — an act or instance of oscillating.
- oscillative — disposed to oscillation
- oscillators — Plural form of oscillator.
- oscillatory — characterized by or involving oscillation.
- oscillogram — the record produced by the action of an oscillograph or oscilloscope.
- osmotically — Physical Chemistry, Cell Biology. the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane. the diffusion of fluids through membranes or porous partitions. Compare endosmosis, exosmosis.
- ostensively — (manner) In an ostensive manner.
- ostensorium — ostensory.