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Definition of Implacental
1. a. Without a placenta, as marsupials and monotremes.
Definition of Implacental
1. Adjective. (zoology) Without a placenta, as marsupials and monotremes. ¹
2. Noun. (zoology) A mammal having no placenta. ¹
¹ Source: wiktionary.com
Medical Definition of Implacental
1.