ENDOPLASM Meaning of ENDOPLASM in English [ 'ɛndə(ʊ)plaz(ə)m ]■ noun Biology, dated the more fluid, granular inner layer of the cytoplasm in amoeboid cells. Compare with ectoplasm (in sense 1). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004