Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


Any of various fishes lacking jaws and true teeth and having a circular sucking mouth, including the hagfishes and the lampreys.

[From New Latin Cyclostomī and Cyclostomata, class names : cyclo- + Greek stoma, stomat-, mouth.]

cy·clos′to·mate′ (sī-klŏs′tə-māt′, -mĭt) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈsaɪkləˌstəʊm; ˈsɪk-)
(Animals) any primitive aquatic jawless vertebrate of the class Cyclostomata, such as the lamprey and hagfish, having a round sucking mouth and pouchlike gills
(Plants) of, relating to, or belonging to the class Cyclostomata
Also called: marsipobranch
cyclostomate, cyclostomatous, cyclostomous adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

jaw′less fish`

1. Also called cyclostome. any fish of the class Agnatha (and order Cyclostomata), characterized by a circular sucking mouth that lacks jaws.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.cyclostome - primitive aquatic vertebratecyclostome - primitive aquatic vertebrate  
agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Cyclostomata, order Cyclostomata - primitive jawless aquatic vertebrate: lampreys; hagfishes
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Locomotory design of 'cyclostome' fishes: spatial arrangement and architecture of myosepta and lamellae.
Still according to this author, the cyclostome genus Petromyzon possesses a thin network of pre-elastic fibers on the skin.
Venom gland apparatus in cyclostome braconid wasps with special reference to the subfamily Doryctinae (Insecta, Hymenoptera, Braconidae).
In the best studied example, cheilostome bryozoans, which arose in the mid-Mesozoic, today tend to out-compete the more ancient cyclostome bryozoans, but this ecological relationship did not give rise to reciprocal diversity patterns through time.
The two main taxonomic groups of agnathan or cyclostome fish are Hyperoartia, lampreys and Hyperotreti, and hagfish (for a review of agnathan ion and water homeostasis see Karnaky, 1998; Evans and Claiborne, 2009).
An unusually large cyclostome bryozoan (Pennipora anomalopora) from the Upper Cretaceous of Maastricht.
Skeletal ultrastructure and phylogeny of cyclostome bryozoans.
Testing for bias in the evolution of coloniality: a demonstration in cyclostome bryozoans.
Robertson (1903) suggested that this could occur in the steno-laemate cyclostome Crista spp., but this has not been further investigated.