blastoderm

[ blas-tuh-durm ]

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

/ 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

Derived Forms

• ˌblastoˈdermic, adjective

Other Words From

• blasto·dermic blasto·der·matic adjective

Word History and Origins

Origin of blastoderm¹

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

Example Sentences

For hardening the blastoderm I have employed, as usual, chromic acid, and also gold chloride.

From Project Gutenberg

If the outlines only of the cells are to be examined, a very short immersion (half a minute) of the blastoderm in a half per cent.

From Project Gutenberg

My observations begin with the blastoderm of a freshly laid egg.

From Project Gutenberg

The changes which the blastoderm undergoes during the first three or four hours of incubation are not very noticeable.

From Project Gutenberg

I have already spoken of the gradation of the hypoblast at the edge of the blastoderm into white yolk.

From Project Gutenberg