| amniocentesis | (n) (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities, Syn. amnio |
| amnion | (n) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals), Syn. amniotic sac, amnios |
| amniota | (n) higher vertebrates (reptiles, birds and mammals) possessing an amnion during development |
| amniote | (n) any member of the Amniota |
| amniotic | (adj) of or related to the amnion or characterized by developing an amnion, Syn. amnionic, amnic |
| amniotic cavity | (n) the fluid-filled cavity that surrounds the developing embryo |
| amniotic fluid | (n) the serous fluid in which the embryo is suspended inside the amnion, Syn. waters, amnionic fluid |
| Amnion | n. [ Gr. &unr_; the membrane round the fetus, dim. of &unr_; lamb. ] (Anat.) A thin membrane surrounding the embryos of mammals, birds, and reptiles. [ 1913 Webster ] |
| Amnios | n. Same as Amnion. [ 1913 Webster ] |
| Amniota | ‖n. pl. [ NL. See Amnion. ] (Zool.) That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals. [ 1913 Webster ] |
| amniote | n. 1. any member of the Amniota. [ WordNet 1.5 ] |
| Amniotic | a. [ Cf. F. amniotique. ] (Anat.) Of or pertaining to the amnion; characterized by an amnion; as, the amniotic fluid; the amniotic sac. [ 1913 Webster ]
Amniotic acid. (Chem.) [ R. ] See Allantoin. [ 1913 Webster ]
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