Arachis hypog[ae]a

from The Collaborative International Dictionary of English v.0.48

Groundnut \Ground"nut`\ (ground"n[u^]t`), n. (Bot.)
   (a) The fruit of the {Arachis hypog[ae]a} (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]

from The Collaborative International Dictionary of English v.0.48

Hypogaeic \Hyp`o*g[ae]"ic\, a. [Pref. hypo- + Gr. gai^a, gh^,
   earth.] (Chem.)
   Pertaining to, or obtained from, the peanut, or earthnut
   ({Arachis hypog[ae]a}).
   [1913 Webster]

   {Hypog[ae]ic acid} (Chem.), an acid in the oil of the
      earthnut, in which it exists as a glyceride, and from
      which it is extracted as a white, crystalline substance.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Peanut \Pea"nut\ (p[=e]"n[u^]t), n. (Bot.)
   The fruit of a trailing leguminous plant ({Arachis
   hypog[ae]a}); also, the plant itself, which is widely
   cultivated for its fruit.
   [1913 Webster]

   Note: The fruit is a hard pod, usually containing two or
         three seeds, sometimes but one, which ripen beneath the
         soil. Called also {earthnut}, {groundnut}, and
         {goober}.
         [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Pindal \Pin"dal\, Pindar \Pin"dar\, n. [D. piendel.] (Bot.)
   The peanut ({Arachis hypog[ae]a}); -- so called in the West
   Indies.
   [1913 Webster]