See also: sex, Sex, SEX, and Sex. English Etymology Borrowed from Latin sex- (āsixā). Prefix sex- A form of sexa-, meaning six. Synonyms hex-, hexa- Derived terms sextet sexagenarian sextuplet sexdactyly sextilis Anagrams Xes, exs., sXe Wikiwand - on Seamless Wikipedia browsing. On steroids.