[1] : The Collaborative International Dictionary of English v.0.48

groundnut \ground"nut`\ ground"nu^t`, n. bot.
   a the fruit of the arachis hypogaea native country
       uncertain; the peanut; the earthnut.
   b a leguminous, twining plant apios tuberosa, producing
       clusters of dark purple flowers and having a root
       tuberous and pleasant to the taste.
   c the dwarf ginseng aralia trifolia. u. s. --gray.
   d a european plant of the genus bunium b. flexuosum,
       having an edible root of a globular shape and sweet,
       aromatic taste; -- called also earthnut, earth
       chestnut, hawknut, and pignut.
       1913 webster
see also:
arachis hypogaea apios tuberosa aralia trifolia bunium b. flexuosum earthnut 
earth chestnut hawknut pignut 

Aralia >> A Words
Aralia, definition of term: Aralia
aralia_pag1.html