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nodule (n.)

"a little lump or knot," c. 1400, from Latin nodulus "small knot," diminutive of nodus "knot" (from PIE root *ned- "to bind, tie"). Related: Nodulated; nodulous; nodulation.

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Definitions of nodule from WordNet

nodule (n.)
a small node;
nodule (n.)
small rounded wartlike protuberance on a plant;
Synonyms: tubercle
nodule (n.)
(mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment);
From wordnet.princeton.edu