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endosome
endosome n. 
/ˈɛndoʊˌsoʊm/ (a) the innermost part of a sponge; (b) Cytology a deeply staining mass of chromatin in the middle of a vesicular nucleus in certain protozoans.
Brit. /ˈɛndə(ʊ)səʊm/
, /ˈɛndə(ʊ)səʊm/U.S. /ˈɛndəˌsoʊm/
, /ˈɛndəˌsoʊm//ˈɛndoʊˌsoʊm/ΚΠ
1887 Encycl. Brit. XXII. 415 A reticulation of ectosome on the one side and of endoderm and mesoderm, i.e., endosome, on the other.
1912 E. A. Minchin Introd. Study Protozoa vi. 73 In the condition with a single, or one greatly preponderating, mass of chromatin, the nuclear space..presents the appearance of a vesicle containing the chromatin-mass at or near its centre;..the chromatinic mass may be termed..an endosome.
1912 E. A. Minchin Introd. Study Protozoa vi. 76 The endosome..in most cases..is composed of a matrix or ground-substance of plastin in which the chromatin is lodged. An endosome of this kind is termed a karyosome.
1926 G. N. Calkins Biol. Protozoa ii. 59 Endosomes may consist entirely of chromatin..or they may be composed of chromatin and plastin in various combinations.
1961 D. L. Mackinnon & R. S. J. Hawes Introd. Study Protozoa i. 12 The term karyosome (the endosome of some authors) is here used descriptively as the name of any conspicuous, deeply staining body lying in the nuclear sap.
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as lemmas