-qui.

Headword: 
-qui.
Principal English Translation: 

archaic verb ending, singular, indicating "having that quality"; known for certain areas, such as Puebla and Tlaxcala

Lockhart’s Nahuatl as Written: 

characteristic ending of many pret. agentive nouns, being the archaic pret. suffix. mainly on Class 2 verbs, some Class 3. abs. pl. -queh. combining form -cā-.