Webster's English Dictionary

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fetus

fe.tus \'fe-t-*s\ n [NL, fr. L, act of bearing young, offspring; akin to L 
   fetus newly delive]red, fruitful - more at FEMININE : an unborn or 
   unhatched vertebrate esp. after attaining the basic structu ral plan of its 
   kind; specif : a developing human from usu. three months after conception 
   to birth