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Webster 1913 Edition
Mesoderm
Mes′o-derm
,Noun.
[
Meso-
+ Gr. δέρμα
skin.] (Biol.)
(a)
The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Illust. of
Blastoderm
and Ectoderm
. (b)
The middle body layer in some invertebrates.
(c)
The middle layer of tissue in some vegetable structures.