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Webster 1913 Edition

Noun.

[Pref.

hypo-

-blast

(Biol.)

The inner or lower layer of the blastoderm; – called also

endoderm

entoderm

, and sometimes

hypoderm

. See Illust. of

, and

hypoblast ‎(plural hypoblasts)

(embryology) A type of tissue that forms from the inner cell mass and later is incorporated into the endoderm