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shell

(Encyclopedia)shell, in zoology, hard outer covering secreted by an animal for protection. It is also called the test, crust, or carapace. The term usually refers to the calcareous shells of the many species of mol...

pharmacology

(Encyclopedia)pharmacology, study of the changes produced in living animals by chemical substances, especially the actions of drugs, substances used to treat disease. Systematic investigation of the effects of drug...

trunkfish

(Encyclopedia)trunkfish, any member of a family of fishes, Ostraciidae, also called boxfishes, that have short triangular bodies covered by firmly united hexagonal bony plates. Only the jaw, the bases of the fins, ...

Tobias, Philip Valentine

(Encyclopedia)Tobias, Philip Valentine, 1925–2012, South African paleoanthropologist, b. Durban. He graduated from the Univ. of Witwatersrand (Ph.D., 1953) and taught there for five decades. Tobias entered paleoa...

Theodora

(Encyclopedia)Theodora thēədôrˈə [key], d. 548, Byzantine empress. Information about her early career comes from the often-questionable source, the Secret History of Procopius. It appears that she was the daug...

Orlando, city, United States

(Encyclopedia)Orlando ôrlănˈdō [key], city (1990 pop. 164,693), seat of Orange co., central Fla., in a lake region; inc. 1875. In a citrus fruit and farm area, it is one of the world's most visited vacation spo...

woodchuck

(Encyclopedia)woodchuck or groundhog, common name of a North American species of marmot, Marmota monax. This large rodent is found in open woods and ravines throughout most of Canada and the NE United States. Its h...

carotene

(Encyclopedia)carotene kârˈətēnˌ [key], long-chained, unsaturated hydrocarbon found as a pigment in many higher plants, particularly carrots, sweet potatoes, and leafy vegetables. Carotene is thought to assist...

Castile–La Mancha

(Encyclopedia)Castile–La Mancha kăstēlˈ–lä mänˈchə [key], autonomous community, 30,680 s...

Çatalhöyük

(Encyclopedia)Çatalhöyük –hü– [key], Neolithic settlement on the Konya Plain in S Turkey that flourished c.6500–c.5800 b.c. The site, first excavated (1961–65) by British archaeologist James Mellaart, o...