perizoniumn.

Brit.

/ˌpɛrᵻˈzəʊnɪəm/, U.S.

/ˌpɛrəˈzoʊniəm/

Origin: A borrowing from German. Etymon: German Perizonium.

Etymology: < German Perizonium (1882 in the passage translated in quot. 1887) < peri- peri- prefix + ancient Greek ζώνη girdle, belt (see zone n.) + German -ium (see -y suffix⁴).

The wall of an auxospore of a diatom.

ΚΠ

1887 H. E. F. Garnsey tr. K. Goebel Outl. Classif. Plants 19 The two cells..grow..alongside of one another to the normal size of auxospores, and on their outer surface..appears a membrane of cellulose, the perizonium.

1946 Nature 26 Oct. 588/1 The siliceous frustules were being burst open and the cell contents extruded, enclosed within an intact perizonium, an extremely tenuous membrane.

1989 Jrnl. Phycol. 25 15 The perizonium consists of concentric overlapping bands, laid down sequentially at the tips of the expanding biconical auxospore.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perizonium
释义	perizoniumn. Brit. /ˌpɛrᵻˈzəʊnɪəm/, U.S. /ˌpɛrəˈzoʊniəm/ Origin: A borrowing from German. Etymon: German Perizonium. Etymology: < German Perizonium (1882 in the passage translated in quot. 1887) < peri- peri- prefix + ancient Greek ζώνη girdle, belt (see zone n.) + German -ium (see -y suffix⁴). The wall of an auxospore of a diatom. ΚΠ 1887 H. E. F. Garnsey tr. K. Goebel Outl. Classif. Plants 19 The two cells..grow..alongside of one another to the normal size of auxospores, and on their outer surface..appears a membrane of cellulose, the perizonium. 1946 Nature 26 Oct. 588/1 The siliceous frustules were being burst open and the cell contents extruded, enclosed within an intact perizonium, an extremely tenuous membrane. 1989 Jrnl. Phycol. 25 15 The perizonium consists of concentric overlapping bands, laid down sequentially at the tips of the expanding biconical auxospore. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1887
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