Definition of peristome in English:

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Pronunciation: /ˈperəˌstōm/


1The parts surrounding the mouth of various invertebrates.
Example sentences
  • Spines and tube feet surrounding the peristome function in locomotion, burrowing, and food-gathering.
  • The peristome can seem quite large.
  • The autozooids have small apertures and often preserve long peristomes inclined at an acute angle to the colony surface.
1.1 Botany A fringe of small projections around the mouth of a capsule in mosses and certain fungi.
Example sentences
  • The sporophytes also develop peristomes and a spongy layer.


Late 18th century: from modern Latin peristoma, from Greek peri- 'around' + stoma 'mouth'.

For editors and proofreaders

Syllabification: per·i·stome

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