noun Cell Biology.
the inner portion of the cytoplasm of a cell. Compare ectoplasm ( def 1 ).

1880–85; endo- + -plasm

endoplasmic, adjective
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World English Dictionary
endoplasm (ˈɛndəʊˌplæzəm)
cytology See ectoplasm the inner cytoplasm in some cells, esp protozoa, which is more granular and fluid than the outer cytoplasm

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American Heritage
Medical Dictionary

endoplasm en·do·plasm (ěn'də-plāz'əm)
A central, less viscous portion of the cytoplasm that is distinguishable in certain cells, especially motile cells and protozoa.

en'do·plas'mic adj.
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Example sentences
At the same time, the ectoplasm at the rear of the tube turns into the liquid endoplasm, taking up the rear.
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