coca

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of certain Andean evergreen shrubs or small trees of the genus Erythroxylum, especially E. coca, whose leaves contain cocaine and other alkaloids.
2. n. The dried leaves of such a plant, chewed by people of the Andes for a stimulating effect and also used for extraction of cocaine and other alkaloids.

Century Dictionary and Cyclopedia

1. n. The dried leaf of Erythroxylon Coca, natural order Linaceæ, a small shrub of the mountains of Peru and Bolivia, but cultivated in other parts of South America. The principal source of the drug as a commercial product is the province of Yungas in Bolivia, where the bushes, which are grown on the sides of the mountains, yield three crops a year. By far the greater part of the estimated annual product of 40,000,000 pounds is consumed at home. It is a stimulant, bearing some resemblance in its effects to tea and coffee, and has long been used as a masticatory by the Indians of South America. It relieves feelings of fatigue and hunger, and the difficulty in breathing experienced in climbing high mountains. The habit of chewing coca is an enslaving one. Coca is used in medicine as a stimulant and tonic; it yields the valuable alkaloid cocaine. Sometimes written cuca.
2. n. The plant itself.
3. n. A Japanese rice-measure, equal to about 5 Winchester bushels.

Wiktionary

1. n. The dried leaf of a South American shrub (Erythroxylon coca), widely cultivated legally in Andean countries, and the source of cocaine.

GNU Webster's 1913

1. n. The dried leaf of a South American shrub (Erythroxylon Coca). In med., called Erythroxylon.

WordNet 3.0

1. n. United States comedienne who starred in early television shows with Sid Caesar (1908-2001)
2. n. a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine
3. n. dried leaves of the coca plant (and related plants that also contain cocaine); chewed by Andean people for their stimulating effect