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selenium

(Encyclopedia)selenium səlēˈnēəm [key], nonmetallic chemical element; symbol Se; at. no. 34; at. wt. 78.96; m.p. 217℃; b.p. about 685℃; sp. gr. 4.81 at 20℃; valence −2, +4, or +6. Selenium is directly ...

serpentine

(Encyclopedia)serpentine sûrˈpəntēn, –tīn [key], hydrous silicate of magnesium. It occurs in crystalline form only as a pseudomorph having the form of some other mineral and is generally found in the form of...

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...

Potawatomi

(Encyclopedia)Potawatomi pŏtˌəwŏtˈəmē [key], Native North Americans whose language belongs to the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). They are close...

Rousseau, Henri

(Encyclopedia)Rousseau, Henri äNrēˈ ro͞osōˈ [key], 1844–1910, French primitive painter, b. Laval. He was entirely self-taught, and his work remained consistently naive and imaginative. Rousseau was called L...

O'Casey, Sean

(Encyclopedia)O'Casey, Sean shôn [key], 1884–1964, Irish dramatist, one of the great figures of the Irish literary renaissance. A Protestant, he grew up in the slum district of Dublin and was active in various s...

Warren, Robert Penn

(Encyclopedia)Warren, Robert Penn, 1905–89, American novelist, poet, and critic, b. Guthrie, Ky., grad. Vanderbilt Univ. 1925; M.A., Univ. of California 1927; B.Litt., Oxford 1930. At Vanderbilt he became associa...

sunfish

(Encyclopedia)sunfish, common name for members of the family Centrachidae, comprising numerous species of spiny-finned, freshwater fishes with deep, laterally flattened bodies found in temperate North America. All ...

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...

soybean

(Encyclopedia)soybean, soya bean, or soy pea, leguminous plant (Glycine max, G. soja, or Soja max) of the family Leguminosae (pulse family), native to tropical and warm temperate regions of Asia, where it has been...