born or engendered in a womb, not twins (see Molina)
Orthographic Variants:
çan cemitime
Alonso de Molina:
zan cemitime. nacidos, o engendrados de vn vientre, no mellizos. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 14r. col. 1. Thanks to Joe Campbell for providing the transcription.