eheca.

Headword: 
eheca.
Principal English Translation: 

for it to be windy (see Molina); o blow lightly, for there to be a breeze, to be windy (see Karttunen)

Orthographic Variants: 
eeca, eeca, yeyeca
Alonso de Molina: 

eeca. (pret. oeecac.) hazer viento, o ayre.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 28r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

EHĒCA pret: EHĒCAC to blow lightly, for there to be a breeze, to be windy / hacer viento, o aire (M) An unreduplicated verb stem related to this is to be expected, but none is attested. This verb and the related noun have identical stems. R has a short vowel and glottal stop in the second syllable in place of a long vowel EHEHCA. See EHĒCA-TL.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 75.

Attestations from sources in English: 

"Zano ipā Diziembre chicahua oyeyecac" = "Also in December strong winds blew." This was in an annals entry for 1634.
Frances Krug, "The Nahuatl Annals of the Tlaxcala-Puebla Region," ch. 5, p. 74, Ph.D. Dissertation draft written in the 1980s, with transcriptions and translations approved by James Lockhart. Cited here by SW.