Definition of peristome
1 : the fringe of teeth surrounding the orifice of a moss capsule
2 : the region around the mouth in various invertebrates
Read the Latest from M-W
Origin and Etymology of peristome
New Latin peristoma, from peri- + Greek stoma mouth — more at stomach
First Known Use: 1799
Medical Dictionary
Seen and Heard
What made you want to look up peristome? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!