Lewis Short
(verb) : prō-tūbĕro, āre
* To swell or bulge out, to grow forth (late Lat.), Sol. 45: poma,id. 46 fin.
* Trop.: densa ne supra modum protuberent,Aus. Idyll. 13, praef. § 8; cf. id. ib. 16, 10.
Charlton T. Lewis, Charles Short, A Latin Dictionary