aplacental

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a·pla·cen·tal

 (ā′plə-sĕn′tl)
adj.
Having no placenta, as marsupials and monotremes.

aplacental

(ˌeɪpləˈsɛntəl; ˌæplə-)
adj
(Zoology) (of monotremes and marsupials) having no placenta
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.aplacental - having no placentaaplacental - having no placenta; "monotremes and marsupials are aplacental mammals"
placental - pertaining to or having or occurring by means of a placenta; "all mammals except monotremes and marsupials are placental mammals"