Noun

(en noun)

(biology, uncountable) The cytoplasm within a cell; the cell outside of the nucleus.

*{{quote-book, 1946, Richard Roksabro Kudo, Protozoology, page=33 citation

, passage=The fundamental component of the protozoan body is the protoplasm which is without exception differentiated into the nucleus and the cytosome .}}

(biology, countable) A type of cellular organelle which is enclosed by a membrane.

*{{quote-book, 1994, R. E. Kendrick & G. H. M. Kronenberg, Photomorphogenesis in Plants, page=725 citation

, passage=Moreover, calcium is concentrated in cytosomes , specific membrane-coated vesicles, which are also known as 'tannin vesicles'.}}