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The Collaborative International Dictionary of English v.0.48:

Zoon \Zo"on\, n.; pl. Zoa. [NL., fr. Gr. zw^,on 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]