kola nut

from 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}]

from The Collaborative International Dictionary of English v.0.48

Kola \Ko"la\, Kola nut \Kola nut\ .
   Same as {Cola}, {Cola nut}.
   [Webster 1913 Suppl.]