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[mez-uh-zoh-uh, mes-, mee-zuh-, -suh-]
noun Zoology.
  1. the phylum of invertebrates comprising the mesozoans, parasitic wormlike multicellular organisms sometimes considered to be intermediate in complexity between protozoans and metazoans.
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Origin of Mesozoa

From New Latin, dating back to 1875–80; see origin at meso-, -zoa
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018