† properistoman.

Forms: 1800s properistoma, 1800s properistome.

Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: pro- prefix², peri- prefix, stoma n.

Etymology: < pro- prefix² + peri- prefix + stoma n., after German Properistoma (1877 in the source translated in quot. 1879). Compare earlier (in different sense) peristoma n.

Embryology. Obsolete. rare.

In Haeckel's terminology: the edge of the primitive mouth (blastopore) of a gastrula.

ΚΠ

1879 tr. E. Haeckel Evol. Man I. viii. 220 At the thickened edges of the gastrula, the primitive mouth-edge (properistoma), the endoderm, and the exoderm pass into each other.

1890 Cent. Dict. Properistome, same as properistoma.

Derivatives

† properistomal adj. Obsolete rare Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Properistomal, pertaining to a properistoma.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2021).

单词	properistoma
释义	† properistoman. Forms: 1800s properistoma, 1800s properistome. Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: pro- prefix², peri- prefix, stoma n. Etymology: < pro- prefix² + peri- prefix + stoma n., after German Properistoma (1877 in the source translated in quot. 1879). Compare earlier (in different sense) peristoma n. Embryology. Obsolete. rare. In Haeckel's terminology: the edge of the primitive mouth (blastopore) of a gastrula. ΚΠ 1879 tr. E. Haeckel Evol. Man I. viii. 220 At the thickened edges of the gastrula, the primitive mouth-edge (properistoma), the endoderm, and the exoderm pass into each other. 1890 Cent. Dict. Properistome, same as properistoma. Derivatives † properistomal adj. Obsolete rare Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Properistomal, pertaining to a properistoma. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2021). < n.1879
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