GNU Collaborative International Dictionary of English

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Found one definition

  1.       
    ‖Zoon (?), n.; pl. Zoa (?). [NL., fr. Gr. ζῷον an animal.] (Zool.) (a) An animal which is the sole product of a single egg; -- opposed to zooid.  H. Spencer. (b) Any one of the perfectly developed individuals of a compound animal.

    [1913 Webster]