embryonic disk
Americannoun
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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.
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the blastodisk of yolky eggs.
Etymology
Origin of embryonic disk
First recorded in 1935–40
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Roughly two weeks after fertilization, more than half of the embryos had an embryonic disk — a flat mass of cells.
From Scientific American ● May 15, 2023
Sole-shaped embryonic disk of the chick, in three successive stages of development, looked at from the dorsal surface, magnified about twenty times, somewhat diagrammatic.
From The Evolution of Man — Volume 1 by Ernst Heinrich Philipp August Haeckel
Three diagrammatic transverse sections of the embryonic disk of the higher vertebrate, to show the origin of the tubular organs from the bending germinal layers.
From The Evolution of Man — Volume 1 by Ernst Heinrich Philipp August Haeckel
He first solved the difficult problem of the transformation of this four-fold, flat, leaf-shaped, embryonic disk into the complete vertebrate body, through the conversion of the layers or plates into tubes.
From The Evolution of Man — Volume 1 by Ernst Heinrich Philipp August Haeckel
We may now disregard both the outer ovolemma and the greater part of the vesicle, and concentrate our attention on the germinative area and the four-layered embryonic disk.
From The Evolution of Man — Volume 1 by Ernst Heinrich Philipp August Haeckel
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
