a crack or a hole in a piece of wood (see Molina)
quauhcamac. hendedura, o agujero de madero. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 86r. col. 2. Thanks to Joe Campbell for providing the transcription.