līchēn, ēnis, m., = λειχήν, a cryptogamic species of vegetation growing on trees, lichen. Lit., Plin. 26, 4, 10, § 21.

— Transf., an eruption on the skin of men and beasts, a tetter, ringworm: in fricando lichene, Plin. 23, 7, 63, § 118: sordidi lichenes, Mart. 11, 98, 5.

—Of beasts, Plin. 30, 10, 27, § 88.

— Esp., a callous excrescence upon the leg of a horse, used as a medicine: lichene equi cum oleo infuso per aurem, Plin. 28, 11, 49, § 180; 28, 17, 67, § 230 saep.