Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A multicellular animal of the subkingdom Metazoa, a division of the animal kingdom in traditional two-kingdom classification systems.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.
  • adj. Having to do with animals that develop from an embryo with three tissue layers.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the Metazoa.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to the Metazoa.
  • n. A member of the Metazoa; a metazoön.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any animal of the subkingdom Metazoa; all animals except protozoans and sponges

Etymologies

From New Latin Metazōa, a subdivision of the animal kingdom : meta- + -zōa, pl. of -zōon, animal; see -zoon.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Metazoa +‎ -an (Wiktionary)

Examples

  • Consider two classes of transcription factors that are known to play crucial roles in metazoan development: the T-box proteins and the SOX proteins.

    2008 April - Telic Thoughts

  • These proteins play essential roles in metazoan development and are considered part of the developmental toolkit as outlined by biologist Sean Carroll.

    2007 September - Telic Thoughts

  • He briefly discusses a recent paper where "The authors concluded that gene loss had been a substantial factor in evolution, and that" the ancestral metazoan is likely to have been much more complex than was previously imagined. "

    Circus of the Spineless

  • They are just the simplest, barest kind of metazoan we can find now.

    The Panda's Thumb: November 2005 Archives

  • I think this is very subjective; I was quite happy with Merriam Webster's definition of "metazoan," for example.

    languagehat.com: COELOM.

  • A data dump now about problems with metazoan (or chordate or mammalian) phylogeny would be getting ahead of the discussion.

    A Disclaimer for Behe?

  • If I were a FLID supporter, I would propose that the homeobox regulatory mechanism for body regions was a "front-loaded design element" that, once it was in place, could be modified extensively via standard evolutionary mechanisms to produce the various metameric metazoan bauplans.

    Ancient Predator Revealed!

  • Even these points are disputable due to their metazoan-centric nature.

    An Unusual Ecosystem

  • There is no compelling evidence that the lineage that led to complex, metazoan life forms (including humans) and the lineage that led to the single-celled Monosiga independently experienced significantly similar niches or were exposed to similar environments.

    Biomolecular Networks

  • Guts: There is no compelling evidence that the lineage that led to complex, metazoan life forms (including humans) and the lineage that led to the single-celled Monosiga independently experienced significantly similar niches or were exposed to similar environments.

    Biomolecular Networks

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