tuber (n.)

"thick underground stem," 1660s, from Latin tuber "edible root, truffle; lump, bump, swelling," from PIE *tubh-, from 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."

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Definitions of tuber

tuber (n.)

a fleshy underground stem or root serving for reproductive and food storage;

Tuber (n.)

type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles;

Synonyms: genus Tuber

From wordnet.princeton.edu

Tuatha de Danann

tub

tuba

tubby

tube

tuber

tubercle

tubercular

tuberculosis

tuberculous

tubing