‖Mon′o‐del″phi‐a (?), n. pl. [NL., fr. Gr. μόνοσ single + δελφύσ the womb.] (Zoöl.) The group that includes all ordinary or placental mammals; the Placentalia. See Mammalia.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.