otztiliztli.

Headword: 
otztiliztli.
Principal English Translation: 

pregnancy; the condition of being pregnant (see Molina)

Alonso de Molina: 

otztiliztli. preñez.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 78r. col. 2. Thanks to Joe Campbell for providing the transcription.