Lewis Short
in-cānesco, canŭi, 3
* V. inch. n., to become white, to turn gray or hoary (poet.): tortaque remigio spumis incanuit unda,Cat. 63, 13: ornusque incanuit albo Flore piri,Verg. G. 2, 71: gelu magnoque incanuit imbre Caucasus,Val. Fl. 6, 611: cum pigra incanuit aetas,Sil. 3, 328.
Charlton T. Lewis, Charles Short, A Latin Dictionary