Definition of mesoderm in English:

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Pronunciation: /ˈmezəˌdərm/
Pronunciation: /ˈmesəˌdərm/


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/ Pronunciation: /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'.

For editors and proofreaders

Syllabification: mes·o·derm

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