The Collaborative International Dictionary of English v.0.48:

Anodyne \An"o*dyne\ ([a^]n"[-o]*d[imac]n), a. [L. anodynus, Gr.
   ? free from pain, stilling pain; 'an priv. + ? pain: cf. F.
   anodin.]
   Serving to assuage pain; soothing.
   [1913 Webster]

         The anodyne draught of oblivion.         --Burke.
   [1913 Webster]

   Note: "The word [in a medical sense] in chiefly applied to
         the different preparations of opium, belladonna,
         hyoscyamus, and lettuce." --Am. Cyc.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Anodyne \An"o*dyne\, n. [L. anodynon. See Anodyne, a.]
   Any medicine which allays pain, as an opiate or narcotic;
   anything that soothes disturbed feelings.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anodyne
    adj 1: capable of relieving pain; "the anodyne properties of
           certain drugs"; "an analgesic effect" [syn: analgesic,
           analgetic, anodyne]
    n 1: a medicine used to relieve pain [syn: analgesic,
         anodyne, painkiller, pain pill]