a piece of linen, or a large cloth or blanket that is very delicate (see Molina)
Orthographic Variants:
iztac canauac
Alonso de Molina:
iztac canauac. lienzo, o manta muy delgada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 49r. col. 2. Thanks to Joe Campbell for providing the transcription.