[ blas-tuh-durm ]
/ ˈblæs təˌdɜrm /

noun Embryology.

the primitive layer of cells that results from the segmentation of the ovum.
the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

Origin of blastoderm

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


blas·to·der·mic, blas·to·der·mat·ic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for blastoderm

British Dictionary definitions for blastoderm

/ (ˈblæstəʊˌdɜːm) /

noun embryol

the layer of cells that surrounds the blastocoel of a blastula
a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg
Also called: blastodisc

Derived forms of blastoderm

blastodermic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for blastoderm

[ blăstə-dûrm′ ]


The layer of cells formed by the cleavage of a fertilized mammalian egg, which later divides into the three germ layers from which the embryo develops.germinal membrane germ membrane

Other words from blastoderm

blas′to•dermal null null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.