Lewis Short
(verb) : ex-tūbĕro, āvi, ātum, 1, and
* A. [tuber] (post-Aug.).
* Neutr., to swell out or up, to rise as a swelling: radice foliosa, ex qua media veluti malum extuberat,Plin. 21, 16, 56, § 96: gemma,id. 37, 8, 33, § 110.
* Act., to cause to swell up, to raise: defert montes, surrigit plana, valles extuberat,Sen. Q. N. 6, 4, 1: extuberatus venter,swollen,Amm. 12, 15, 23; 25, 10, 13; cf. Sol. 27 med.
Charlton T. Lewis, Charles Short, A Latin Dictionary