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mesoderm Line breaks: meso|derm
Pronunciation: /ˈmɛsə(ʊ)dəːm/
/ˈmɛzə(ʊ)dəːm/ /ˈmiːsə(ʊ)dəːm/ /ˈmiːzə(ʊ)dəːm/

Definition of mesoderm in English:


[mass noun] Embryology
The middle layer of cells or tissues of an embryo, or the parts derived from this (e.g. cartilage, muscles, and bone).
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: /mɛsə(ʊ)ˈdəːm(ə)l/ /mɛzə(ʊ)ˈdəːm(ə)l/ /miːsə(ʊ)ˈdəːm(ə)l/ /miːzə(ʊ)ˈdəːm(ə)l/
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.


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

Definition of mesoderm in:
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