Pronunciation: (sī'klu-stōm", sik'lu-), [key]
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.
a cyclostome vertebrate; a lamprey or hagfish.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.