The Collaborative International Dictionary of English v.0.48:

Handicap \Hand"i*cap\, v. t. [imp. & p. p. Handicapped
   (-k[a^]pt); p. pr. & vb. n. Handicapping.]
   To encumber with a handicap in any contest; hence, in
   general, to place at disadvantage; as, the candidate was
   heavily handicapped.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Handicapped \Hand"i*capped\ (h[a^]nd"[i^]*k[a^]pt), a.
   suffering from a handicap (in senses 4 or 5); disabled; at a
   disadvantage.
   [PJC]

WordNet (r) 3.0 (2006):

handicapped
    adj 1: incapable of functioning as a consequence of injury or
           illness [syn: disabled, handicapped]
    n 1: people collectively who are crippled or otherwise
         physically handicapped; "technology to help the elderly and
         the disabled" [syn: disabled, handicapped]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "handicapped":
   amputee, bad, castrated, cripple, crippled, defective, deformity,
   disabled, emasculated, game, halt, halting, hamstrung,
   handicapped person, hobbling, idiot, imbecile, incapable,
   incapacitated, lame, limping, maimed, paralytic, paraplegic,
   quadriplegic, spavined, the crippled, the handicapped