Etymology
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tubercle (n.)

1570s, from Latin tuberculum "a small swelling," diminutive of tuber "lump" (from PIE root *teue- "to swell").

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Definitions of tubercle

tubercle (n.)
a swelling that is the characteristic lesion of tuberculosis;
tubercle (n.)
small rounded wartlike protuberance on a plant;
Synonyms: nodule
tubercle (n.)
a protuberance on a bone especially for attachment of a muscle or ligament;
Synonyms: tuberosity / eminence
From wordnet.princeton.edu