The Collaborative International Dictionary of English v.0.48:

Garlic \Gar"lic\, n. [OE. garlek, AS. g[=a]rle['a]c; gar spear,
   lance + le['a]c leek. See Gar, n., and Leek.]
   1. (Bot.) A plant of the genus Allium (A. sativum is the
      cultivated variety), having a bulbous root, a very strong
      smell, and an acrid, pungent taste. Each root is composed
      of several lesser bulbs, called cloves of garlic, inclosed
      in a common membranous coat, and easily separable.
      [1913 Webster]

   2. A kind of jig or farce. [Obs.] --Taylor (1630).
      [1913 Webster]

   Garlic mustard, a European plant of the Mustard family
      (Alliaria officinalis) which has a strong smell of
      garlic.

   Garlic pear tree, a tree in Jamaica (Crat[ae]va
      gynandra), bearing a fruit which has a strong scent of
      garlic, and a burning taste.
      [1913 Webster]

WordNet (r) 3.0 (2006):

garlic mustard
    n 1: European herb that smells like garlic [syn: garlic
         mustard, hedge garlic, sauce-alone, jack-by-the-
         hedge, Alliaria officinalis]