Definition of Metazaan

Met`a*zo"an (?), n.; pl. Metazoans (&?;). (Zoöl.) One of the Metazoa.

- Webster's Unabridged Dictionary (1913)

(zoology): Any animal that undergoes development from an embryo stage with three tissue layers, namely the ectoderm, mesoderm, and endoderm. The term applies to all animals except the sponges.
Having to do with animals that develop from an embryo with three tissue layers.

- The Nuttall Encyclopedia

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The correct Spelling of this word is: Metazoan

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