implacentalia

Implacentalia

Im`pla*cen*ta"li*a\, n. pl. [NL. See In- not, and Placental.] (Zo["o]l.) A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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