tlachtemalacatl.

Headword: 
tlachtemalacatl.
Principal English Translation: 

a circular stone with a hole through the middle, usually placed on the side of a ball court

Attestations from sources in English: 

A key object of the ball game was getting the rubber ball through the hole. (Central Mexico, sixteenth century)
Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan, et al. (Norman: University of Oklahoma Press, 1997), 200.