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preformation n. 預先形成 預先形成 preformation n 1: a theory (popular in the 18th century and now discredited) that an individual develops by simple enlargement of a tiny fully formed organism (a homunculus) that exists in the germ cell [synonym: {preformation}, {theory of preformation}] Preformation \Pre`for*ma"tion\, n. (Biol.)
An old theory of the pre["e]xistence of germs. Cf. {Embo[^i]tement}. [1913 Webster]
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