spermaceti

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Related to spermacetis: sperm whale

sper·ma·cet·i

(sper'mă-set'ē),
A peculiar fatty, waxy substance, chiefly cetin (cetyl palmitate), obtained from the head of the sperm whale, Physeter macrocephalus; used to impart firmness to ointment bases.
Synonym(s): cetaceum
[sperma- + G. ketos, whale]