| 释义 |
implacental, a. and n. Zool.|ɪmpləˈsɛntəl|
[f. im-2 + placental (f. placenta + -al1); cf. mod.L. Implacentālia neut. pl., name of the group.]
A. adj. Having no placenta, a term applied to the group of mammals consisting of the marsupials and monotremes (Implacentalia).
1839–47Todd Cycl. Anat. III. 257/1 The quadrupeds..above defined, are..implacental. 1865Draper Intell. Devel. Europe xxiii. 562 Mammals, both placental and implacental.
B. n. A mammal that has no placenta; a marsupial or monotreme.
1864in Webster. |