Implacental

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Implacental \Im`pla*cen"tal\, a. (Zool.)
     Without a placenta, as marsupials and monotremes;
     nonplacental. -- n. A mammal having no placenta; a
     nonplacental mammal.
     [1913 Webster]