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embryonic disk

noun, Embryology.
Also called embryonic shield. in the early embryo of mammals, the flattened inner cell mass that arises at the end of the blastocyst stage and from which the embryo begins to differentiate.
the blastodisk of yolky eggs.
Origin of embryonic disk
First recorded in 1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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embryonic shield in Medicine

embryonic shield n.
See embryonic disk.

embryonic disk n.

  1. A platelike mass of cells in the blastocyst from which a mammalian embryo develops. Also called embryonic shield.

  2. See germinal disk.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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