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):

chicory
    n 1: the dried root of the chicory plant: used as a coffee
         substitute [syn: chicory, chicory root]
    2: 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]
    3: root of the chicory plant roasted and ground to substitute
       for or adulterate coffee [syn: chicory, chicory root]
    4: crisp spiky leaves with somewhat bitter taste [syn:
       chicory, curly endive]