Spermaceti
a neutral, inodorous, and nearly tasteless, fatty substance, extracted from the oily matter of the head of the sperm whale by filtration and treatment with potash-ley. It is white, brittle, soft to the touch, sp. gr., 0.943 at 15°, melts from 38° to 47°, and is chiefly used in ointments and cerates. Spermaceti was formerly given as a medicine; now it is chiefly employed externally as an emollient and in the preparation of a blistering paper.