fe·tus /ˈfitəs/
  胎兒
  fe·tus /ˈfɪtəs/ 名詞
  Fe·tus n.; pl. Fetuses   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 fœtus.]
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  fetus
       n : an unborn or unhatched vertebrate in the later stages of
           development showing the main recognizable features of the
           mature animal [syn: foetus]