(definition) by Webster 1913 Wed Dec 22 1999 at 0:19:51

Im`pla*cen*ta"li*a (?), n. pl. [NL. See In- not, and Placental.] Zool.

A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed.

 

© Webster 1913.

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