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owl

(Encyclopedia)owl, common name for nocturnal birds of prey found on all continents. Owls superficially resemble short-necked hawks, except that their eyes are directed forward and are surrounded by disks of radiati...

kinetic-molecular theory of gases

(Encyclopedia)kinetic-molecular theory of gases, physical theory that explains the behavior of gases on the basis of the following assumptions: (1) Any gas is composed of a very large number of very tiny particles ...

poisonous plant

(Encyclopedia)poisonous plant, any plant possessing a property injurious to man or animal. Plants may be poisonous to the touch (e.g., poison ivy, poison sumac), or orally toxic (e.g., poison hemlock, deadly amanit...

badger

(Encyclopedia)badger, name for several related members of the weasel family. Most badgers are large, nocturnal, burrowing animals, with broad, heavy bodies, long snouts, large, sharp claws, and long, grizzled fur. ...

stroke

(Encyclopedia)stroke, destruction of brain tissue as a result of intracerebral hemorrhage or infarction caused by thrombosis (clotting) or embolus (obstruction in a blood vessel caused by clotted blood or other for...

sun grebe

(Encyclopedia)sun grebe, common name for a tropical, mainly aquatic bird of the family Heliornithidae. Sun grebes, also called finfoots, are remarkable for their colorful, puffy-toed, webbed feet, which may serve a...

Tasaday

(Encyclopedia)Tasaday, alleged band of 25 hunter-gatherers living in the Philippine rain forest, purportedly contacted by Westerners for the first time in 1971 in southern Mindanao (Cotabato Province). They reporte...

white dwarf

(Encyclopedia)white dwarf, in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation). Typically, a white dwarf star has the mass of the sun and the radius of...

wind chill

(Encyclopedia)wind chill, the cooling effect of wind and temperature combined, expressed in terms of the effect produced by a lower, windless temperature, also called wind chill factor, wind chill temperature, wind...

Weston, Edward

(Encyclopedia)Weston, Edward, 1886–1958, American photographer, b. Highland Park, Ill. Weston began to make photographs in Chicago parks in 1902, and his works were first exhibited in 1903 at the Art Institute of...