Webster’s Revised Unabridged Dictionary · 1913
Ichthyol
Ich′thy·ol, n. [Gr. ἰχθύς, ἰχθύος, a fish + (prob.) L. oleum oil; but cf. Ichthyolite.] (Chem.) An oily substance prepared by the dry distillation of a bituminous mineral containing fossil fishes. It is used in medicine as a remedy in some forms of skin diseases.