Fetus Fe"tus (f[=e]"t[u^]s), n.; pl. {Fetuses} (f[=e]"t[u^]s*[e^]z). [L. fetus, foetus, a bringing forth, brood, offspring, young ones, cf. fetus fruitful, fructified, that is or was filled with young; akin to E. fawn a deer, fecundity, felicity, feminine, female, and prob. to do, or according to others, to be.] The young or embryo of a vertebrate animal in the womb, or in the egg; often restricted to the later stages in the development of viviparous and oviparous animals. showing the main recognizable features of the mature animal, {embryo} being applied to the earlier stages. [Written also {f[oe]tus}.] [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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