• WordNet 3.6
    • n Cyclostomata primitive jawless aquatic vertebrate: lampreys; hagfishes
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Webster's Revised Unabridged Dictionary
    • n. pl Cyclostomata (Zoöl) A division of Bryozoa, in which the cells have circular apertures.
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Century Dictionary and Cyclopedia
    • cyclostomata A division of gymnolæmatous polyzoans having tubular cells, partially free or entirely connate, a terminal opening with a movable lip, and no avicularia nor vibracula: opposed to Chilostomata and Ctenostomata. It is subdivided into Articulata or Radicata (family Crisiidœ), and Inarticulata or Inculatata, containing the rest of the families.
    • cyclostomata In Günther's system of classification, a subclass of fishes having the following technical characters: the skeleton cartilaginous and notochordal, without ribs and without real jaws; skull not separate from the vertebral column; no limbs; gills in the form of fixed sacs without branchial arches, 6 or 7 in number on each side; one nasal aperture only; mouth circular or sucker-like; and heart without bulbus arteriosus. Also called Cyclostomi, Cyclostomia, Marsipobranchii, and Monorhina.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. ky`klos circle + sto`ma -atos mouth


In literature:

It is absent as a distinct gland in the Acrania and Cyclostomata.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8" by Various
The Cyclostomata are exclusively marine.
"Freshwater Sponges, Hydroids & Polyzoa" by Nelson Annandale
In the Cyclostomata (lamprey and hag), and Fishes, the heart has the same arrangement which has been noticed in the human embryo.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various
B, Condition as it occurs in Cyclostomata, sturgeons, embryos of bony Actinopterygians.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
Leaving the Cyclostomata, as the above fishes are called, we reach the true fishes, which have limbs and scales.
"Stories of the Universe: Animal Life" by B. Lindsay