1 Zoology The parts surrounding the mouth of various invertebrates.
- 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.
Late 18th century: from modern Latin peristoma, from Greek peri- 'around' + stoma 'mouth'.
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