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Cyclostomes, such as these lampreys, are so named for their round mouths.


French cyclostome, from Ancient Greek κύκλος (kúklos, circle) + στόμα (stóma, mouth).


cyclostome (plural cyclostomes)

  1. Any of various primitive jawless fish of the class Cyclostomata, such as the lamprey or hagfish.
    • 1811, André Marie Constant Duméril, "On the Sense of Smell in Fishes", Journal of Natural Philosophy, Chemistry, and the Arts, volume 29, page 344:
      Except the cyclostomes, as the lampreys and sphagobranchiæ, which are not real fishes, as I shall show elsewhere.
    • 1835, William Kirby, On the Power Wisdom and Goodness of God, volume 2, William Pickering, page 390:
      The Cyclostomes, or suckers, with regard to their skeletons, are the most imperfect of all the Vertebrates,





Ancient Greek κύκλος (kúklos, circle) + στόμα (stóma, mouth).


cyclostome m (plural cyclostomes)

  1. cyclostome
    • 1806, André Marie Constant Duméril, Zoologie analytique, page 100:
      Le famille des cyclostomes comprend des poissons qui diffèrent de tous les animaux de la même classe, et même de tous les vertébrés, par la forme de leur bouche, et qui paroissent avoir certains rapports avec diverses espèces de néréïdes et d’amphinomes.

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