something hardened; or, something taken as a stone, such as a piece of snow (ice, hail) (see Molina)
IPAspelling:
tekiːski
Alonso de Molina:
tequizqui. cosa empedernida, o que se toma como piedra, assi como el pedazo de nieue. &c. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 105v. col. 2. Thanks to Joe Campbell for providing the transcription.