betel nut

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The seed of the betel palm, chewed with leaves from the betel plant, slaked lime, and flavorings as a mild stimulant.

from The Century Dictionary.

• noun The nut of the arecapalm, Areca Catechu, of the East Indies, highly esteemed among the Asiatics as a masticatory. See areca-nut.

from the GNU version of the Collaborative International Dictionary of English.

• The nutlike seed of the areca palm, chewed in the East with betel leaves (whence its name) and shell lime.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An egg-shaped seed of the betel palm; wrapped in the leaves of the betel pepper and chewed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun seed of betel palm; chewed with leaves of the betel pepper and lime as a digestive stimulant and narcotic in southeastern Asia