blastoderm
Americannoun
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the primitive layer of cells that results from the segmentation of the ovum.
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the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.
noun
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the layer of cells that surrounds the blastocoel of a blastula
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a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg
Other Word Forms
Etymology
Origin of blastoderm
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.
Such words as "blastoderm", "sindoc," "peris," "parasang," "sarcenet," "teazel," "nullah," "cantatrice," "barracan," "sistrum," writhed and hissed in her verses.
From Time Magazine Archive
This by successive divisions forms a group of four to eight cells, which subsequently pass through the blastoderm, and dividing into two groups become symmetrically arranged and surrounded by the rudiments of the ovarian tubes.
From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" by Various
In some parasitic Hymenoptera there is only a single embryonic membrane formed by delamination from the blastoderm, while in a few insects, including the wingless spring-tails, the embryonic membranes are vestigial or entirely wanting.
From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" by Various
The origin and development of the blastoderm or germinal disc has nothing to do with recapitulation of the phylogeny.
From Naturalism And Religion by Otto, Rudolf
The relation between the unfertilised egg and the blastoderm which arises from it is not made altogether clear by Schwann.
From Form and Function A Contribution to the History of Animal Morphology by E. S. (Edward Stuart) Russell
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.
