The Collaborative International Dictionary of English v.0.48:

Divaricate \Di*var"i*cate\, v. i. [imp. & p. p. Divaricated;
   p. pr. & vb. n. Divaricating.] [L. divaricatus, p. p. of
   divaricare to stretch apart; di- = dis- + varicare to
   straddle, fr. varicus straddling, fr. varus stretched
   outwards.]
   1. To part into two branches; to become bifid; to fork.
      [1913 Webster]

   2. To diverge; to be divaricate. --Woodward.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Divaricate \Di*var"i*cate\, v. t.
   To divide into two branches; to cause to branch apart.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Divaricate \Di*var"i*cate\, a. [L. divaricatus, p. p.]
   1. Diverging; spreading asunder; widely diverging.
      [1913 Webster]

   2. (Biol.) Forking and diverging; widely diverging; as the
      branches of a tree, or as lines of sculpture, or color
      markings on animals, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

divaricate
    v 1: branch off; "The road divaricates here"
    2: spread apart; "divaricate one's fingers"

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "divaricate":
   aberrate, be distinct, be distinguished, bear off, bend, bifurcate,
   branch, branch off, branch out, break up, broach, capricious,
   centrifugal, change the bearing, changeable, changing, chink,
   choppy, clash with, cleave, conflict with, contrast with, crack,
   crevasse, curve, cut, cut open, delta-shaped, deltalike, deltoid,
   depart from, deploy, detour, deviate, deviate from, deviating,
   deviative, deviatory, differ, different, differentiate, digress,
   disaccord with, disagree with, disorderly, dispart, dissent,
   disunify, divagate, divaricate from, divaricating, diverge,
   diverge from, divergent, diverging, diversified, diversiform,
   diversify, divide, erose, erratic, fan out, fan-shaped, fanlike,
   fissure, fly open, fork, furcate, go away, go off, heel, impulsive,
   incise, inconsistent, inconstant, irregular, jagged, jar with,
   jerky, lay open, mercurial, motley, mutable, nonconformist,
   nonstandard, nonuniform, not accord with, not square with, ope,
   open, open up, outspread, palmate, palmated, part, pluralistic,
   ragged, ramify, relieve, rent, rift, rip, rive, rough, separate,
   sheer, shift, slit, spasmodic, splay, splayed, split, sporadic,
   spread, spread out, spring open, stand apart, stand over against,
   stem, swerve, swing open, tack, tap, tear, tear open, throw open,
   trend, trifurcate, turn, turn aside, unequable, unequal, uneven,
   unorthodox, unstable, unsteady, unsystematic, ununiform, variable,
   variate, variegate, variegated, variform, various, vary, varying,
   veer, wavering