tlainayalli. cosa escondida o solapada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 121v. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TLAĪNĀYAL-LI something hidden, put away / cosa escondida o solapada (M) [(1)Cf.46v]. See ĪNĀY(A). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 272.