ueuecauhtica. de tarde en tarde o raramente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 157r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
HUEHHUEHCĀUHTICA sometimes, now and then / de tarde en tarde o raremente (M) [(1)Rp.83]. redup. HUEHCĀUHTICA Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 83.