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[met-uh-zoh-uh] /ˌmɛt əˈzoʊ ə/
a zoological group comprising the multicellular animals.
Origin of Metazoa
From New Latin, dating back to 1870-75; See origin at meta-, -zoa
Related forms
metazoan, adjective, noun
metazoic, metazoal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for Metazoa
Historical Examples
  • In general, however symbiosis is rarer in the Metazoa than in the metaphyta.

    The Wonders of Life Ernst Haeckel
  • Minot had tried to prove that the death of Metazoa is due to the greater differentiation and specialization of their tissues.

  • In the systematic section of this work the embryological history of the Metazoa has been treated.

  • There are but few groups of the Metazoa which are not provided with optic organs of greater or less complexity.

  • These are presented to us when we study the early stages in the development of the embryos of the Metazoa in general.

  • But among the Metazoa we find this form of individuality only in the lower (and generally stationary) stages of development.

    The Wonders of Life Ernst Haeckel
  • Parasitism in the Metazoa (in all groups) is even more frequent and interesting than in the metaphyta.

    The Wonders of Life Ernst Haeckel
  • The chief motor organs in the Metazoa are the muscles which constitute the "flesh" of the body.

    The Wonders of Life Ernst Haeckel
  • In the lower and higher classes of the Metazoa the muscle amounts to no more than a thin layer of flesh underneath the skin.

    The Wonders of Life Ernst Haeckel
  • The gastrula stage was the palingenetic repetition of the ancestral form of all Metazoa, the Gastræa.

    Form and Function E. S. (Edward Stuart) Russell
Metazoa in Medicine

Metazoa Met·a·zo·a (mět'ə-zō'ə)
A subdivision of the animal kingdom that includes all multicellular animal organisms having cells that are differentiated and form tissues and organs.

met'a·zo'an adj. & n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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