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implacental

A ที่ ไม่มี รก 

 

Webster's 1913 Dictionary

IMPLACENTAL

IMPLACENTAL Im `pla *cen "tal, a. (Zoöl.)

 

Defn: Without a placenta, as marsupials and monotremes. -- n.

 

Defn: A mammal having no placenta.

 

IMPLACENTALIA

Im `pla *cen *ta "li *a, n. pl. Etym: [NL. See In- not, and Placental. ](Zoöl.)

 

Defn: A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed.