n.
Pronunciation: ' per- ə - ˌ st ō m
Function: noun
Etymology: New Latin peristoma, from peri- + Greek stoma mouth ― more at STOMACH
Date: circa 1796
1 : the fringe of teeth surrounding the orifice of a moss capsule
2 : the region around the mouth in various invertebrates
– peri · sto · mi · al \ ˌ per- ə - ' st ō -m ē - ə l \ adjective