The Collaborative International Dictionary of English v.0.48:
Endoplasm \En"do*plasm\, n. [Endo- + Gr. ? anything formed or molded.] (Biol.) The protoplasm in the interior of a cell. [1913 Webster]WordNet (r) 3.0 (2006):
endoplasm n 1: the inner portion of the cytoplasm of a cell