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zoo- word-forming element meaning "animal, living being," from Greek zoion "an animal," literally "a living being," from PIE root *gwei- "to live" (source also of Greek bios "life").
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joie de vivre (n.)1889, French, literally "joy of living."
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Related entries & more also bio-genesis, 1870, "theory that living organisms arise only from the agency of pre-existing living organisms," coined by English biologist T.H. Huxley from Greek bios "life" (from PIE root *gwei- "to live") + -genesis "birth, origin, creation." Meaning "the theoretical evolution of living matter from complex inanimate chemicals" is from 1960. Related: Biogenetic; biogenetical.
amphibian (n.)"one of the class of animals between fishes and reptiles, having gills and living in water in the early stage of life, later living on land," 1835; from amphibian (adj.). Amphibia was used in this sense from c. 1600.
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Related entries & more 1620s, "action of retiring to or living in the country," from Latin rusticationem (nominative rusticatio) "act or fact of living in the country," noun of action from past-participle stem of rusticari "live or stay in the country," from rusticus (see rustic).
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amphibious (adj.)1640s, "combining two qualities; having two modes of life," especially "living both on land and in water," from Latinized form of Greek amphibios "having a double life; living on land and in water" (see amphibian (adj.)). Of motor vehicles, from 1915.
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