Medical Dictionary

Implacentalia

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noun plural Im·plac·en·ta·lia \(ˈ)im-ˌplas-ən-ˈtā-lē-ə\

Medical Definition of Implacentalia

  1. in former classifications :  the monotremes and marsupials regarded as a systematic unit characterized by the absence or rudimentary development of a placenta


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