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organelle (n.)

"small specialized structure within a cell," 1910, from Modern Latin organella (1909), a diminutive from Latin organum "instrument," in Medieval Latin "organ of the body" (see organ).

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Definitions of organelle from WordNet

organelle (n.)
a specialized part of a cell; analogous to an organ;
the first organelle to be identified was the nucleus
Synonyms: cell organelle / cell organ
From wordnet.princeton.edu