‖Im′pla‐cen‐ta″li‐a (?), n. pl. [NL. See In- not, and Placental.] (Zoöl.) A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.