microsome
noun
mi·cro·some
ˈmī-krə-ˌsōm
1
: any of various minute cellular structures
2
: a particle in a particulate fraction that is obtained by heavy centrifugation of broken cells and consists of various amounts of ribosomes, fragmented endoplasmic reticulum, and mitochondrial cristae
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Merriam-Webster unabridged
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