something straight and properly measured (see Molina)
Alonso de Molina:
tlamelauhca tamachiuhtli. cosa derecha y justamente medida. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 126v. col. 1. Thanks to Joe Campbell for providing the transcription.