| a. | 1. | Of or pertaining to the placenta; having, or characterized by having, a placenta; |
| 2. | (Zool.) Of or pertaining to the Placentalia. | |
| n. | 1. | (Zool.) One of the Placentalia. |
| Noun | 1. | placental - mammals having a placenta; all mammals except monotremes and marsupials |
| Adj. | 1. | placental - of or having or occurring by means of a placenta; "all mammals except monotremes and marsupials are placental mammals" Antonyms: aplacental - having no placenta; "monotremes and marsupials are aplacental mammals" |
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