coca Syllabification: (co·ca)Pronunciation: /ˈkōkə/Definition of coca noun a tropical American shrub that is widely grown for its leaves, which are the source of cocaine. Erythroxylum coca, family Erythroxylaceae the dried leaves of the coca plant, which are mixed with lime and chewed as a stimulant by the indigenous people of western South America. Origin: late 16th century: from Spanish, from Aymara kuka or Quechua kokacoca in other Oxford dictionaries Definition of coca in the British & World English dictionary