Main Entry: tu·ber

Pronunciation: \ˈtü-bər, ˈtyü-\

Function: noun

Etymology: Latin, swelling, truffle; perhaps akin to Latin tumēre to swell — more at thumb

Date: 1668

1 a : a short fleshy usually underground stem bearing minute scale leaves each of which bears a bud in its axil and is potentially able to produce a new plant — compare bulb, corm b : a fleshy root or rhizome resembling a tuber
2 : tuberosity