Spermaceti

Zell's Condensed Dictionary · 1879 · p. 43

(spurm-a-set'e.) [From L. sperm a, seed, andGr. ke tos, a sea-monster.) (Chem.) A white crystalline fatty substance occurring with sperm-oil in the head of the sperm-whale. It is very soft and brittle, and melts at abt. 104°. Sp. gr. 0-943. [s. 845]