21-letter words containing o, n, c, t, m, y
- olympic national park — a national park in NW Washington. 1323 sq. mi. (3425 sq. km).
- persistence of memory — a painting (1931) by Salvador Dali.
- potassium thiocyanate — a colorless, crystalline, hygroscopic, water-soluble solid, KSCN, used chiefly in the manufacture of chemicals, dyes, and drugs.
- primitive dicotyledon — any living relative of early angiosperms that branched off before the evolution of monocotyledons and eudicotyledons. The group comprises about 5 per cent of the world's plants
- psychomotor agitation — agitation (def 3).
- psychomotor-agitation — the act or process of agitating; state of being agitated: She left in great agitation.
- pulmonary circulation — the circulation of blood from the heart to the lungs for oxygenation and back to the heart.
- redevelopment company — a private corporation or a public agency that stimulates the improvement of land, as through a building project subject to certain designs and controls, by financing, selling, or leasing such real estate to interested buyers or lessees.
- reinforcement therapy — a behavior modification technique in which appropriate behavior is strengthened through systematic reinforcement.
- rocky mountain locust — a migratory locust, Melanoplus spretus, that occurs in North America, especially the Great Plains, where swarms cause great damage to crops and other vegetation.
- rocky mountain oyster — mountain oyster.
- scarlet monkey flower — any of various plants belonging to the genus Mimulus, of the figwort family, as M. cardinalis (scarlet monkey flower) having spotted flowers that resemble a face.
- secondary containment — Secondary containment is a system for dealing with hazardous spills.
- sympathetic vibration — a vibration induced by resonance.
- the student community — the body of students in further and higher education, considered as a whole
- therapeutic community — a group-based form of therapy for mental disorders, sometimes residential
- to stick in your mind — If something sticks in your mind, it remains firmly in your memory.
- volumetric efficiency — the ratio of fluid delivered by a piston or ram pump per stroke to the displacement volume of the piston or ram
- youth training scheme — (formerly, in Britain) a scheme, run by the Training Agency, to provide vocational training for unemployed 16–17-year-olds