[sahy-kluh-stohm, sik-luh-]
  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.
  1. a cyclostome vertebrate; a lamprey or hagfish.

Origin of cyclostome

First recorded in 1825–35; cyclo- + -stome Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for cyclostome

Historical Examples of cyclostome

British Dictionary definitions for cyclostome


  1. any primitive aquatic jawless vertebrate of the class Cyclostomata, such as the lamprey and hagfish, having a round sucking mouth and pouchlike gills
  1. of, relating to, or belonging to the class Cyclostomata
Also called: marsipobranch
Derived Formscyclostomate (saɪˈklɒstəmɪt, -ˌmeɪt) or cyclostomatous (ˌsaɪkləʊˈstɒmətəs, -ˈstəʊmə-, ˌsɪk-), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cyclostome in Science


  1. Any of various jawless fish of the order Cyclostomata, having a long, eellike body without scales, a cartilaginous skeleton, and a disklike mouth used for sucking juices from prey. Cyclostomes include the hagfish and lampreys, although some scientists classify these two groups as separate orders.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.