noun.
the middle, germinallayer of undifferentiatedcells of an early embryo; it becomes the mesoderm
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
Word Usage
"The epithelium of the trachea here consists of three or four layers of compactly arranged cells; this epithelium is surrounded by a dense mass of mesoblast which is responsible for the greater thickness of the trachea as seen in figure"