The Collaborative International Dictionary of English v.0.48:

Curtail \Cur"tail\ (k?r"t?l), n.
   The scroll termination of any architectural member, as of a
   step, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Curtail \Cur*tail"\ (k[u^]r*t[=a]l"), v. t. [imp. & p. p.
   Curtailed (-t[=a]ld"); p. pr. & vb. n. Curtailing.] [See
   Curtal.]
   To cut off the end or tail, or any part, of; to shorten; to
   abridge; to diminish; to reduce.
   [1913 Webster]

         I, that am curtailed of this fair proportion. --Shak.
   [1913 Webster]

         Our incomes have been curtailed; his salary has been
         doubled.                                 --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

curtail
    v 1: place restrictions on; "curtail drinking in school" [syn:
         restrict, curtail, curb, cut back]
    2: terminate or abbreviate before its intended or proper end or
       its full extent; "My speech was cut short"; "Personal freedom
       is curtailed in many countries" [syn: clip, curtail, cut
       short]

Moby Thesaurus II by Grady Ward, 1.0:

162 Moby Thesaurus words for "curtail":
   abate, abbreviate, abrade, abridge, abstract, arrest, bate,
   bereave, bleed, bob, boil down, bridle, capsulize, check,
   circumscribe, clip, coarct, compact, compress, concentrate,
   condense, consolidate, constrain, constrict, constringe, contain,
   contract, control, cool, cool off, cramp, crop, curb, cut,
   cut back, cut down, cut off, cut off short, cut short, damp,
   dampen, decelerate, decrease, deduct, deflate, depreciate, depress,
   deprive, deprive of, derogate, detract, diminish, disentitle,
   disparage, divest, dock, dompt, downgrade, drain, draw, draw in,
   draw together, ease one of, eat away, elide, enjoin, epitomize,
   erode, extract, file away, foreshorten, govern, guard, hinder,
   hold, hold at bay, hold back, hold fast, hold in, hold in check,
   hold in leash, hold up, impair, inhibit, keep, keep back,
   keep from, keep in, keep in check, keep under control, knit,
   lay under restraint, leach, lessen, lighten one of, lower, milk,
   mine, minify, mow, narrow, nip, pare, poll, pollard, prohibit,
   prune, pucker, pucker up, pull, pull in, purify, purse, reap,
   recap, recapitulate, reduce, refine, rein, rein in, remove,
   restrain, retard, retrench, roll back, rub away, scale down,
   set back, shave, shear, shorten, simplify, slash, slow down, snub,
   solidify, step down, straiten, strangle, strangulate, stunt,
   subduct, subtract, sum up, summarize, synopsize, take away,
   take away from, take from, take in, tap, telescope, thin, thin out,
   trim, truncate, tune down, wear away, weed, withdraw, withhold,
   wrinkle