veretrum

Etymology
Ostensibly from, equal to ; however De Vaan (2008) is sceptical about this.

Noun

 * 1) the external genitals, penis, vulva; the clitoris

Usage notes
Although several sources (Isidore, De Vaan) cite this word as referring specifically to the male genitals, the 4-5th century physician Caelius Aurelianus uses it to refer to the female reproductive organ as a whole. This restriction would also make redundant the phrase  (in Varro).