The Collaborative International Dictionary of English v.0.48:

Protract \Pro*tract"\, v. t. [imp. & p. p. Protracted; p. pr.
   vb. n. Protracting.] [L. protractus, p. p. of protrahere to
   forth, protract; pro forward + trahere to draw. See
   Portrait, Portray.]
   1. To draw out or lengthen in time or (rarely) in space; to
      continue; to prolong; as, to protract an argument; to
      protract a war.
      [1913 Webster]

   2. To put off to a distant time; to delay; to defer; as, to
      protract a decision or duty. --Shak.
      [1913 Webster]

   3. (Surv.) To draw to a scale; to lay down the lines and
      angles of, with scale and protractor; to plot.
      [1913 Webster]

   4. (Zool.) To extend; to protrude; as, the cat can protract
      its claws; -- opposed to retract.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Protracted \Pro*tract`ed\, a.
   Prolonged; continued.
   [1913 Webster]

   Protracted meeting,a religious meeting continued for many
      successive days. [U. S.]
      [1913 Webster] -- Pro*tract"ed*ly, adv. --
      Pro*tract"ed*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

protracted
    adj 1: relatively long in duration; tediously protracted; "a
           drawn-out argument"; "an extended discussion"; "a lengthy
           visit from her mother-in-law"; "a prolonged and bitter
           struggle"; "protracted negotiations" [syn: drawn-out,
           extended, lengthy, prolonged, protracted]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "protracted":
   de longue haleine, dragged out, dragging, drawn, drawn out,
   drawn-out, elongated, endless, everlasting, extended, filled out,
   interminable, languishing, lasting, lengthened, lengthy, lingering,
   long, long-continuing, long-drawn, long-drawn-out, long-pending,
   long-spun, long-winded, longiloquent, longsome, marathon,
   never-ending, overlong, padded, prolix, prolongated, prolonged,
   pulled, spun out, spun-out, straggling, strained, stretched,
   stretched out, stretched-out, strung out, talkative, taut, tense,
   tight, unrelenting, verbose, windy, wordy