Spĕrm'a-cē'ti, n.

n. [Lat. sperma, sperm, and cetus, Gr. κῆτος, any large sea-animal, a whale.] A fatty matter obtained chiefly from the head of the cachalot, or spermaceti whale. When separated from the oil and purified, it is a white, semi-transparent, brittle, lamellar, crystalline mass, and is much used for making candles. Ure.