• WordNet 3.6
    • n polyzoan sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding
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Webster's Revised Unabridged Dictionary
    • n Polyzoan (Zoöl) Any species of Polyzoa; one of the Polyzoa.
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Century Dictionary and Cyclopedia
    • polyzoan Consisting of many zoöids, polypides, or persons in one compound or colonial aggregate; specifically, pertaining to the Polyzoa, or having their characters; bryozoan.
    • n polyzoan A member of the Polyzoa; a polyzoön.
    • n polyzoan An individual element of a compound polyzoön; a polypide.
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In literature:

The "Lace-corals," a group of Palaeozoic Polyzoans.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson