Cerium, huius cerij, Genus vlceris, Plin. A sore like a honye combe.
Lewis and Short: Latin dictionary
cērĭum, ii, n., = khri/on (v. Liddell and Scott, under the word, II.), a bad species of swelling or ulcer, Plin. 20, 2, 6, 11; 23, 7, 63, 119 (in Cels. 5, 28, 13, written as Greek).