| 释义 |
allantois Phys.|əˈlæntəʊɪs|
[mod.L. in form, a factitious sing. f. the earlier form allantoīdes, ad. Gr. ἀλλαντο-ειδής: see allantoid.]
The fœtal membrane (so named by ancient anatomists from its form in a calf) found only in mammals, birds, and reptiles, which lies between the amnion and chorion, and forms a means of communication between the fœtal and maternal blood.
1646Sir T. Browne Pseud. Ep. 270 The Allantois is a thin coat seated under the Corion, wherein are received the watery separations conveyed by the Urachus. 1691Ray Creation (1701) 82 Abundance of urine in the Allantoides. 1879Syd. Soc. Lex. s.v., [In birds] by its proximity to the shell, the allantois is an important respiratory organ. |