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

  • n. The middle germinal layer of an early embryo, consisting of undifferentiated cells destined to become the mesoderm.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the middle, germinal layer of undifferentiated cells of an early embryo; it becomes the mesoderm

from the GNU version of the Collaborative International Dictionary of English

  • n. The mesoderm.
  • n. The cell nucleus; mesoplast.

from The Century Dictionary and Cyclopedia

  • n. The middle one of the three germinal layers of any metazoic embryo, between the epiblast and the hypoblast; the mesoderm.
  • n. In cytology, the middle one of three concentric protoplasmic layers supposed to surround the cell-nucleus.

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

  • n. the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue


meso- + -blast (Wiktionary)



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