The Collaborative International Dictionary of English v.0.48:

Restorative \Re*stor"a*tive\ (r?*st?r"?*t?v), a. [Cf. F.
   restoratif.]
   Of or pertaining to restoration; having power to restore.
   [1913 Webster]

         Destroys life's enemy,
         Hunger, with sweet restorative delight.  --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Restorative \Re*stor"a*tive\, n.
   Something which serves to restore; especially, a restorative
   medicine. --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

restorative
    adj 1: tending to impart new life and vigor to; "the renewing
           warmth of the sunshine" [syn: renewing, restorative,
           reviving, revitalizing, revitalising]
    2: promoting recuperation; "recuperative powers"; "strongly
       recuperative remedies"; "restorative effects of exercise"
       [syn: recuperative, restorative]
    n 1: a medicine that strengthens and invigorates [syn: tonic,
         restorative]
    2: a device for treating injury or disease [syn: corrective,
       restorative]

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "restorative":
   Phoenixlike, activator, adjuvant, aid, alterative, analeptic,
   animator, arouser, assistance, astringent, balm, balsam, bracer,
   bracing, compensatory, cordial, corrective, corroborant, curative,
   cure, curing, energizer, healing, healing agent, healing quality,
   help, human dynamo, iatric, indemnificatory, invigorating, life,
   medicative, medicinal, motivating force, motive power, pick-me-up,
   prescription, re-creative, re-formative, reappearing, receipt,
   recipe, redeeming, redemptional, redemptive, refreshing,
   regenerative, relief, remedial, remedial measure, remedy,
   renascent, reorganizational, reparative, reparatory, reproductive,
   restitutive, restitutory, resurgent, retributive, reversional,
   reversionary, revertible, revisional, reviving, roborant, sanative,
   sanatory, sovereign remedy, spark plug, specific, specific remedy,
   stimulant, stimulating, stimulator, stimulus, strengthening,
   succor, therapeutic, theriac, tonic, vitamin shot, vulnerary,
   wholesome