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Rhône, river, Switzerland and France

(Encyclopedia)Rhône, Lat. Rhodanus, river, 505 mi (813 km) long, rising in the Rhône glacier, NE Valais, Switzerland. It flows west through a narrow, flat valley that separates the Bernese Alps from the Pennine A...

rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

ovary

(Encyclopedia)ovary, ductless gland of the female in which the ova (female reproductive cells) are produced. In vertebrate animals the ovary also secretes the sex hormones estrogen and progesterone, which control t...

olive oil

(Encyclopedia)olive oil, pale yellow to greenish oil obtained from the pulp of olives by separating the liquids from solids. Olive oil was used in the ancient world for lighting, in the preparation of food, and as ...

oriole

(Encyclopedia)oriole, common name applied to various perching birds of the Old (family Oriolidae) and New (family Icteridae) Worlds. The European orioles are allied to the crows, while the American orioles, of the ...

vinegar

(Encyclopedia)vinegar, sour liquid consisting mainly of acetic acid and water, produced by the action of bacteria on dilute solutions of ethyl alcohol derived from previous yeast fermentation. The coloring and flav...

Valentinus

(Encyclopedia)Valentinus văləntēˈnəs [key], fl. c.135–c.160, founder of the Valentinians, the most celebrated of the Gnostic sects (see Gnosticism) of the 2d cent. The little that is known of his life is fou...

vampire bat

(Encyclopedia)vampire bat, name for the blood-drinking bats of the family Desmodontidae, found in the New World tropics. Vampire bats feed exclusively on the blood of living animals and are thus the only true paras...

Somerset, county, England

(Encyclopedia)Somerset, county (1991 pop. 459,100), 1,333 sq mi (3,453 sq km), SW England, on the Bristol Channel. The county seat is Taunton. The terrain is generally low and flat in the center (the location of th...

South Island

(Encyclopedia)South Island or Te Waipounamu [Maori,=the waters of greenstone] (1996 pop. 900,114), 58,093 sq mi (150,461 sq km), New Zealand. It is the larger but less populous of the two principal islands of the c...