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Webster 1913 Edition

Noun.

[

Endo-

+ Gr. [GREEK], [GREEK], flesh.]

(Biol.)

The semifluid, granular interior of certain unicellular organisms, as the inner layer of sarcode in the amœba; entoplasm; endoplasta.

endosarc ‎(uncountable)

(biology) The semifluid, granular interior of certain unicellular organisms, such as the inner layer of sarcode in the amoeba.