ic yeilhuitl semana.

(a loanword from Spanish)

Headword: 
ic yeilhuitl semana.
Principal English Translation: 

Tuesday (see Molina); the third day of the week
(partly a loanword from Spanish, semana, week)

Alonso de Molina: 

ic yeilhuitl semana. el martes.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 32v. col. 2. Thanks to Joe Campbell for providing the transcription.