chimalcaltia.

Headword: 
chimalcaltia.
Principal English Translation: 

to protect oneself from the sun and rain with a kind of shield (see Molina)

IPAspelling: 
tʃiːmɑlkɑltiɑ
Alonso de Molina: 

chimalcaltia. nino. (pret. oninochimalcalti.) adargarse, o escudarse, yguarecerse con rodela del sol y del agua.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 21r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

At the root: chimalli (shield) and calli (house or head covering).

themes: 
Weather, Climate