blastoderm

American  

[blas-tuh-durm] / ˈblæs təˌdɜrm /

noun

Embryology.

1. the primitive layer of cells that results from the segmentation of the ovum.

2. the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

---

blastoderm British  

/ ˈblæstəʊˌdɜːm /

noun

1. the layer of cells that surrounds the blastocoel of a blastula

2. a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg

---

Other Word Forms

• blastodermatic adjective
• blastodermic adjective

Etymology

Origin of blastoderm

First recorded in 1855–60; blasto- + -derm

Example Sentences

Such words as "blastoderm", "sindoc," "peris," "parasang," "sarcenet," "teazel," "nullah," "cantatrice," "barracan," "sistrum," writhed and hissed in her verses.

From Time Magazine Archive

According to his account the cells of the blastoderm are formed actually in the ovum.

From Form and Function A Contribution to the History of Animal Morphology by E. S. (Edward Stuart) Russell

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

Let the Creator say, if you like, 'I will establish an antipathetic symbiosis between thee and the female, and between thy blastoderm and her blastoderm.'

From Back to Methuselah by Shaw, Bernard

This layer is the blastoderm, the simple epithelium from the cells of which all the tissues of the body proceed.

From The Evolution of Man — Volume 2 by Haeckel, Ernst Heinrich Philipp August