1 Zoology The parts surrounding the mouth of various invertebrates.
More 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.
late 18th century: from modern Latin peristoma, from Greek peri- 'around' + stoma 'mouth'.
Definition of peristome in:
- The US English dictionary