The Collaborative International Dictionary of English v.0.48:

Chicory \Chic"o*ry\, n. [F. chicor['e]e, earlier also
   cichor['e]e, L. cichorium, fr. Gr. ?, ?, Cf. Succory.]
   1. (Bot.) A branching perennial plant (Cichorium Intybus)
      with bright blue flowers, growing wild in Europe, Asia,
      and America; also cultivated for its roots and as a salad
      plant; succory; wild endive. See Endive.
      [1913 Webster]

   2. The root, which is roasted for mixing with coffee.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Cichorium intybus
    n 1: perennial Old World herb having rayed flower heads with
         blue florets cultivated for its root and its heads of crisp
         edible leaves used in salads [syn: chicory, succory,
         chicory plant, Cichorium intybus]