/ik tham"awl, -ol; ik"theuh mawl', -mol'/ , n. Pharm.
a viscous, reddish-brown to brownish-black substance, obtained by the destructive distillation of bituminous shales, used in medicine chiefly as an antiseptic, analgesic, and local stimulant in skin disorders.
[ 1905-10; ICHTH(YO)- (from ichthyosulfonate ) + AMM(ONIUM) + -OL 1 ]