apla·cen·tal /ˌepləˈsɛntḷ/ 形容詞 無胎盤的
Ap·la·cen·tal, a. Belonging to the Aplacentata; without placenta. ◄ ►
aplacental adj : having no placenta; "monotremes and marsupials are aplacental mammals" [ant: placental]