cachalot n. (Zoöl.) The sperm whale (Physeter macrocephalus). It has in the top of its head a large cavity, containing an oily fluid, which, after death, concretes into a whitish crystalline substance called spermaceti. See Sperm whale.
... the year 1690 the brave and hardy fishermen of the north-east coasts of North America established that systematic pursuit of the cachalot which has thriven so wonderfully ever since, although it must be confessed that the last few years have witnessed a serious decline in ... — The Cruise of the Cachalot - Round the World After Sperm Whales • Frank T. Bullen
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