proamnionn.

Brit.

/prəʊˈamnɪən/, U.S.

/proʊˈæmniˌɑn/,

/proʊˈæmniən/

Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: pro- prefix², amnion n.

Etymology: < pro- prefix² + amnion n., after French proamnios (E. van Beneden & C. Julin 1884, in Arch. de biol. 5 374).

Embryology.

In many vertebrate embryos: an area of blastoderm, located at the cephalic end, in which there is no mesoderm separating the ectoderm and endoderm.

ΚΠ

1887 Amer. Naturalist 21 396 There is found a proamnion not only in Rodents, Bats, and Marsupials, but also in Carnivora and Insectivora.

1931 Q. Rev. Biol. 6 23/1 Primordial germ cells were first seen in the embryo during the primitive streak stage at the outer edge of the proamnion anterior and antero-lateral to the head fold.

1979 Nature 9 Aug. 499/1 Between the mesoderm and the anterior boundary of the area pellucida is the proamnion, which is without mesoderm.

1998 Philos. Trans. (Royal Soc.) B. 353 1105/1 A small, extra-embryonic proamnion..immediately abuts and surrounds the rostral extremity of the head process.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	proamnion
释义	proamnionn. Brit. /prəʊˈamnɪən/, U.S. /proʊˈæmniˌɑn/, /proʊˈæmniən/ Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: pro- prefix², amnion n. Etymology: < pro- prefix² + amnion n., after French proamnios (E. van Beneden & C. Julin 1884, in Arch. de biol. 5 374). Embryology. In many vertebrate embryos: an area of blastoderm, located at the cephalic end, in which there is no mesoderm separating the ectoderm and endoderm. ΚΠ 1887 Amer. Naturalist 21 396 There is found a proamnion not only in Rodents, Bats, and Marsupials, but also in Carnivora and Insectivora. 1931 Q. Rev. Biol. 6 23/1 Primordial germ cells were first seen in the embryo during the primitive streak stage at the outer edge of the proamnion anterior and antero-lateral to the head fold. 1979 Nature 9 Aug. 499/1 Between the mesoderm and the anterior boundary of the area pellucida is the proamnion, which is without mesoderm. 1998 Philos. Trans. (Royal Soc.) B. 353 1105/1 A small, extra-embryonic proamnion..immediately abuts and surrounds the rostral extremity of the head process. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1887
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