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frostweed

(Encyclopedia)frostweed or frostwort, North American woodland flowers (Helianthemum canadense and sometimes other related species) of the family Cistaceae (rockrose family). In cold weather, crystals of ice shoot f...

Platen, August Graf von

(Encyclopedia)Platen, August Graf von ouˈgo͝ost gräf fən pläˈtən [key], 1796–1835, German poet, whose original name was August Graf von Platen-Hallermünde. An opponent of romanticism, he satirized it in s...

Dulles, John Foster

(Encyclopedia)Dulles, John Foster dŭlˈəs [key], 1888–1959, U.S. secretary of state (1953–59), b. Washington, D.C.; brother of Allen Dulles, grandson of John Watson Foster, secretary of state under President ...

Dewar flask

(Encyclopedia)Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned. It consists of two flasks, one placed inside the other, with a vacuum between. The vacuum prevents the ...

Vavilov, Sergei Ivanovich

(Encyclopedia)Vavilov, Sergei Ivanovich vəvēˈləf [key], 1891–1951, Russian physicist. In 1932 he became director of the P. N. Lebedev Physical Institute, which he organized around the laboratory of the Sovie...

sneeze

(Encyclopedia)sneeze, involuntary violent expiration of air through the nose and mouth. It results from stimulation of the nervous system in the nose, causing sudden contraction of the muscles of expiration. The st...

sprain

(Encyclopedia)sprain, stretching or wrenching of the ligaments and tendons of a joint, often with rupture of the tissues but without dislocation. Sprains occur most commonly at the ankle, knee, or wrist joints, cau...

degree-day

(Encyclopedia)degree-day, a unit of measure used to estimate the fuel and power requirements in heating and cooling a building; it is equal to a difference of 1 degree between the outdoor daily average temperature ...

Watson, James Dewey

(Encyclopedia)Watson, James Dewey, 1928–, American biologist and educator, b. Chicago, Ill., grad. Univ. of Chicago, 1947, Ph.D. Univ. of Indiana, 1950. With F. H. C. Crick he began (1951) research on the molecul...

hotbed

(Encyclopedia)hotbed, low, glass-covered frame structure for starting tender plants. It differs from a cold frame only in that the soil is heated—either artificially as by underground electric wiring or steampipe...