21-letter words containing ai
- pick someone's brains — to obtain information or ideas from someone
- poor robin's plantain — the rattlesnake weed, Hieracium venosum.
- portrait photographer — a photographer who specializes in portraits
- privacy enhanced mail —
- promoter of the faith — devil's advocate (def 2).
- push up (the) daisies — to be dead and buried
- pyrenean mountain dog — a large heavily built dog of an ancient breed originally used to protect sheep from wild animals: it has a long thick white coat with a dense ruff
- reconnaissance flight — a flight made by an aircraft in order to obtain military information about a particular place
- reconnaissance patrol — a patrol made by soldiers in order to obtain military information about a particular place
- ring down the curtain — to lower the curtain at the end of a theatrical performance
- 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.
- rolling in the aisles — (of an audience) overcome with laughter
- roodepoort-maraisburg — a city in S Transvaal, in the NE Republic of South Africa.
- sail against the wind — to sail a course that slants slightly away from the true direction of the wind; sail closehauled
- saint anthony's cross — tau cross.
- saint elias mountains — a mountain range between SE Alaska and the SW Yukon, Canada. Highest peak: Mount Logan, 5959 m (19 550 ft)
- saint lawrence seaway — a series of channels, locks, and canals between Montreal and the mouth of Lake Ontario, a distance of 182 miles (293 km), enabling most deep-draft vessels to travel from the Atlantic Ocean, up the St. Lawrence River, to all the Great Lakes ports: developed jointly by the U.S. and Canada.
- saint martin's summer — mild, warm weather similar to Indian summer, occurring in November.
- saint valentine's day — February 14, observed in honor of St. Valentine as a day for the exchange of valentines and other tokens of affection.
- saint-maur-des-fosses — a town in N central France, near Paris, on the Marne River.
- san gabriel mountains — a mountain range in S California, N of Los Angeles. Highest peak, San Antonio Peak, 10,080 feet (3072 meters).
- san gorgonio mountain — a mountain in S California: highest peak in the San Bernardino Mountains. 11,502 feet (3506 meters).
- secondary containment — Secondary containment is a system for dealing with hazardous spills.
- spicebush swallowtail — a swallowtail butterfly, Papilio troilus, having a dark body with yellow spots on the forewings and greenish hind wings.
- splice the main brace — to join together or unite (two ropes or parts of a rope) by the interweaving of strands.
- stained glass ceiling — a situation in a church organization in which promotion for a female member of the clergy appears to be possible, but discrimination prevents it
- strategic air command — a U.S. Air Force command charged with intercontinental air strikes, especially nuclear attacks.
- swim against the tide — to resist prevailing opinion
- the battle of britain — from August to October 1940, the prolonged bombing of S England by the German Luftwaffe and the successful resistance by the RAF Fighter Command, which put an end to the German plan of invading Britain
- the early renaissance — the period from about 1400 to 1500 in European, esp Italian, painting, sculpture, and architecture, when naturalistic styles and humanist theories were evolved from the study of classical sources, notably by Donatello, Masaccio, and Alberti
- the flickertail state — a name for the state of North Dakota
- to be arrayed against — to be opposed to
- to be in dire straits — to be in a position of acute difficulty
- to let your hair down — If you let your hair down, you relax completely and enjoy yourself.
- toussaint l'ouverture — François Dominique [frahn-swa dawmee-neek] /frɑ̃ˈswa dɔmiˈnik/ (Show IPA), 1743–1803, Haitian patriot and leader of the Haitian Revolution slave rebellion.
- twist the lion's tail — a large, usually tawny-yellow cat, Panthera leo, native to Africa and southern Asia, having a tufted tail and, in the male, a large mane.
- uncertainty principle — the principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other, such that the product of the uncertainties of both quantities is equal to or greater than h/ 2 π, where h equals Planck's constant.
- virginia (rail) fence — a zigzag fence made of rails laid across one another at the ends
- youth training scheme — (formerly, in Britain) a scheme, run by the Training Agency, to provide vocational training for unemployed 16–17-year-olds