/suy"kleuh stohm', sik"leuh-/ , adj.
1. belonging or pertaining to the Cyclostomata, a subclass of jawless, eellike, marine vertebrates of the class Agnatha, comprising the lampreys and hagfishes.
2. having a circular mouth.
n.
3. a cyclostome vertebrate; a lamprey or hagfish.
[ 1825-35; CYCLO- + -STOME ]