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

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

The rudimentary thorax presents traces of a division into three segments; and the dorso-lateral margins of the cephalic blastoderm, behind the procephalic lobes, have a sinuous margin.

From On the Origin and Metamorphoses of Insects by Lubbock, John, Sir

Endoderm: the inner layer of the blastoderm in the embryo, giving origin to the mid-intestine and other visceral organs: see entoderm.

From Explanation of Terms Used in Entomology by Smith, John. B.

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