cihuayotl.

Headword: 
cihuayotl.
Principal English Translation: 

female genitals and womb (see Karttunen)

Orthographic Variants: 
ciuayo, ciuayotl
IPAspelling: 
siwɑːjoːtɬ
Alonso de Molina: 

ciuayotl. la madre do concibe la muger.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 22v. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

CIHUĀYŌ-TL pl: -MEH female genitals and womb / la madre do concibe la mujer (M), matriz, vulva (S) [(3)Xp.82]. See CIHUĀ-TL, -YŌ.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 35.

Attestations from sources in English: 

in cihuāyōtl = femininity, womanhood, female sexual organs
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 98.