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Definition of Aplacental
1. Adjective. Having no placenta. "Monotremes and marsupials are aplacental mammals"
Antonyms: Placental
Definition of Aplacental
1. a. Belonging to the Aplacentata; without placenta.
Definition of Aplacental
1. Adjective. Lacking a placenta; belonging to the Aplacentata. ¹
¹ Source: wiktionary.com
Medical Definition of Aplacental
1. Without a placenta; denoting the monotremes (which lay eggs and have no placenta) and the marsupials (which have a transitory simple yolk-sac placenta). (05 Mar 2000)