Learn how to say Spermaceti correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word spermaceti:
a white waxy substance produced by the sperm whale, formerly used in candles and ointments. It is present in a rounded organ in the head, where it focuses acoustic signals and aids in the control of buoyancy.
late 15th century: from medieval Latin, from late Latin sperma ‘sperm’ + ceti ‘of a whale’ (genitive of cetus, from Greek kētos ‘whale’), from the belief that it was whale spawn