<P> The sperm whale uses echolocation and vocalization as loud as 230 decibels (re 1 μPa at 1 m) underwater . It has the largest brain on Earth, more than five times heavier than a human's . Sperm whales can live for more than 60 years . </P> <P> Spermaceti (sperm oil), from which the whale derives its name, was a prime target of the whaling industry, and was sought after for use in oil lamps, lubricants, and candles . Ambergris, a solid waxy waste product sometimes present in its digestive system, is still highly valued as a fixative in perfumes, among other uses . Beachcombers look out for ambergris as flotsam . Sperm whaling was a major industry in the nineteenth century, immortalised in the novel Moby Dick . The species is protected by the International Whaling Commission moratorium, and is listed as vulnerable by the International Union for Conservation of Nature . </P> <P> The name sperm whale is a truncation of spermaceti whale . Spermaceti, originally mistakenly identified as the whales' semen, is the semi-liquid, waxy substance found within the whale's head (see below). The sperm whale is also known as the "cachalot", which is thought to derive from the archaic French for "tooth" or "big teeth", as preserved for example in cachau in the Gascon dialect (a word of either Romance or Basque origin). The etymological dictionary of Corominas says the origin is uncertain, but it suggests that it comes from the Vulgar Latin cappula, plural of cappulum, "sword hilt". The word cachalot came to English via French from Spanish or Portuguese cachalote, perhaps from Galician / Portuguese cachola, "big head". The term is retained in the Russian word for the animal, кашалот (kashalot), as well as in many other languages . </P> <P> The scientific genus name Physeter comes from Greek physētēr (φυσητήρ), meaning "blowpipe, blowhole (of a whale)", or--as a pars pro toto--"whale". The specific name macrocephalus is Latinized from the Greek makrokephalos (μακροκέφαλος, meaning "big - headed"), from makros (μακρός, "large") + kefalos (κέφαλος, "head"). </P>

Where did the name sperm whale come from
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