to be pale, discolored due to cold weather or pregnancy (see Molina)
IPAspelling:
iːʃtisektik
Alonso de Molina:
ixticectic. descolorido por frio, o por preñez. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 47v. col. 2. Thanks to Joe Campbell for providing the transcription.