tubercle (n.)

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

*teuə-, also *teu-, Proto-Indo-European root meaning "to swell."

It forms all or part of: butter; contumely; creosote; intumescence; intumescent; protuberance; protuberant; psychosomatic; somato-; -some (3) "body, the body;" soteriology; Tartuffe; thigh; thimble; thousand; thole (n.); thumb; tumescent; tumid; tumor; truffle; tuber; tuberculosis; tumult; tyrosine.

It is the hypothetical source of/evidence for its existence is provided by: Avestan tuma "fat;" Greek tylos "callus, lump;" Latin tumere "to swell," tumidus "swollen," tumor "a swelling;" Lithuanian tukti "to become fat;" Lithuanian taukas, Old Church Slavonic tuku, Russian tuku "fat of animals;" Old Irish ton "rump."

1799, "characterized by tubers," from Latin tuberculum (see tubercle) + -ar. From 1898 as "having tuberculosis."

"characterized by tubers," 1747, from Latin tuberculum (see tubercle) + -ous.

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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

tub

tuba

tubby

tube

tuber

tubercle

tubercular

tuberculosis

tuberculous

tubing

tubular