microsome noun. ['mʌɪkrǝsǝʊm] L19.
[from MICRO- + -SOME³.]
Cytology. Orig., a small granule in the cytoplasm of a cell. Now, a cytoplasmic particle consisting of a fragment of endoplasmic reticulum and attached ribosomes from a cell disrupted by ultracentrifugation; a ribosome in an intact cell.

■ micro'somal adjective L19.

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