pitztli.

Headword: 
pitztli.
Principal English Translation: 

the stone or pit from a piece of fruit (see Molina and Karttunen)

IPAspelling: 
piːtstɬi
Alonso de Molina: 

pitztli. cuexco o huesso de cierta fruta.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 82v. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

PĪTZ-TLI pit, stone of a fruit / cuesco o hueso de cierta fruta (M) [(1)Tp.127].
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 199.

Attestations from sources in English: 

See an image that represents pitztli in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).