a seat made from fatwood (pine that has a lot of pitch, called ocote in Spanish today) (see Molina)
Alonso de Molina:
oco icpalli. silla o assentadero de palo de pino. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 75v. col. 1. Thanks to Joe Campbell for providing the transcription.