Lewis Short
ob-rĭgesco, găi, 3
* V. inch. n., to stiffen, become stiff (class.).
* Lit.
* With abl.: pars obrigescit frigore, Lucil. ap. Non. 97, 12: pars (terrae regionum) obriguerit nive, pruināque,Cic. N. D. 1, 10, 24; and: e quibus (cingulis) duos obriguisse pruinā vides,id. Rep. 6, 20, 21.
* Trop., to grow hard, become hardened: viro non vel obrigescere satius est?Sen. Ep. 82, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary