Pla‐cen″tal (?), a. 1. Of or pertaining to the placenta; having, or characterized by having, a placenta; as, a placental mammal.
2. (Zoöl.) Of or pertaining to the Placentalia.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.