Share this entry
mesoderm Syllabification: mes·o·derm
Pronunciation: /ˈmezəˌdərm/

Definition of mesoderm in English:


The middle layer of an embryo in early development, between the endoderm and ectoderm.
Example sentences
  • The stem cells for hematopoiesis in mammals are derived from mesoderm in the yolk sac blood islands and a region of the aorta.
  • Teratomas are germ cell tumors composed of various tissue elements representing more than one embryonic layer (ectoderm, mesoderm, and endoderm).
  • Structures derived from ectoderm, mesoderm, and endoderm are commonly represented.


Pronunciation: /ˌmezəˈdəməl/ /mē-/
Example sentences
  • In most polychaetes, the ectodermal and mesodermal derivatives of the growth zone become incorporated into segmental tissues in an anterior-posterior sequence.
  • The cells of these paraxial mesodermal cords eventually coalesce into the somites.
  • Alternative and related hypotheses include those that deal explicitly with engrailed in mesodermal units, chordate evolution, and terminal posterior addition of iterated elements in development.
Pronunciation: /-ˈdərmik/
Example sentences
  • A coelom is a body cavity lined by a mesodermic epithelium.
  • The primacy of the vascular mesodermic network could explain facts not understood on a neural basis.
  • A key stage in the development of higher animals is the specification of endodermic and mesodermic cells.


Late 19th century: from meso- 'middle' + Greek derma 'skin'.

Definition of mesoderm in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources