The Collaborative International Dictionary of English v.0.48:
Kola \Ko"la\, Kola nut \Kola nut\ . Same as Cola, Cola nut. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
kola nut n 1: bitter brown seed containing caffein; source of cola extract [syn: kola nut, cola nut] 2: tree bearing large brown nuts containing e.g. caffeine; source of cola extract [syn: kola, kola nut, kola nut tree, goora nut, Cola acuminata]