Etymology

peristome

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Today it means: One or two rings of tooth-like appendages surrounding the opening of the capsule of many mosses. Full definition →

English peri- ← Ancient Greek περῐ́ (perĭ́) ← Proto-Indo-European *per-
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The story

  1. Proto-Indo-European*per-
  2. Ancient Greekπερῐ́ (perĭ́)
  3. Englishperi-
  4. English todayperistome

From peri- + -stome.

Etymology from Wiktionary, CC BY-SA 4.0.