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The Collaborative International Dictionary
Peritreme

Peritreme \Per"i*treme\, n. [Pref. peri- + Gr. ? a hole.] (Zo["o]l.)

  1. That part of the integument of an insect which surrounds the spiracles.

  2. The edge of the aperture of a univalve shell.

Wiktionary
peritreme

n. 1 (context zoology English) That part of the integument of an insect which surrounds the spiracles. 2 (context zoology English) The edge of the aperture of a univalve shell.