Lewis & Short

sānesco, ĕre, v. inch. n. [sanus], to become sound, get well, heal (post-Aug.): insanientes sub somno sanescunt, Cels. 3, 18: corpus, id. 2, 8: ulcera, id. 3, 22; Plin. 17, 23, 35, § 214: vulnera, Col. 6, 7, 4: cutis, Cels. 8, 4 et saep.