tepilli.

Headword: 
tepilli.
Principal English Translation: 

female genitals (see Molina); the vulva (see Karttunen)

IPAspelling: 
tepilli
Alonso de Molina: 

tepilli. natura de hembra.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 103r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

TEPIL-LI vulva / natura de hembra (M), pudenda muliebria (C) [(1)Cf.128r]. C contrasts the honorific of this, TEPILTZIN, with TĒPILTZIN 'offspring.' The word for 'penis' is TEPOL-LI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 230.

Attestations from sources in English: 

tepiltemalli = corrupted matter from the vulva;
tepiltemalatl = corrupted watery matter from the vulva;
tepileztli = blood of vulva;
tepiltzotzomatli = vulva rag;
tepilocotzotl, tepilocotzoyotl = resin-like secretion of the vulva;
tepiltzonqualactli = vulvar humor
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 138.

themes: 
Women, Men, Gender
Health, Sickness, Wellness, Medicine
Sexuality, Fertility