Tuber, n. [L., a hump. knob; probably akin to tumere to swell. Cf. Tumid.].
A fleshy, rounded stem or root, usually containing starchy matter, as the potato or arrowroot; a thickened root-stock. See Illust. of Tuberous. [1913 Webster]
Tuber, n.
1 a the short thick rounded part of a stem or rhizome, usu. found underground and covered with modified buds, e.g. in a potato. b the similar root of a dahlia etc.
2 Anat. a lump or swelling.
Etymology
L, = hump, swelling
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