The Collaborative International Dictionary of English v.0.48:

Ramify \Ram"i*fy\ (r[a^]m"[i^]*f[imac]), v. t. [imp. & p. p.
   Ramified (-f[imac]d); p. pr. & vb. n. Ramifying.] [F.
   ramifier, LL. ramificare, fr. L. ramus a branch + -ficare (in
   comp.) to make. See -fy.]
   To divide into branches or subdivisions; as, to ramify an
   art, subject, scheme.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ramify \Ram"i*fy\, v. i.
   1. To shoot, or divide, into branches or subdivisions, as the
      stem of a plant.
      [1913 Webster]

            When they [asparagus plants] . . . begin to ramify.
                                                  --Arbuthnot.
      [1913 Webster]

   2. To be divided or subdivided, as a main subject.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ramify
    v 1: have or develop complicating consequences; "These actions
         will ramify" [syn: complexify, ramify]
    2: grow and send out branches or branch-like structures; "these
       plants ramify early and get to be very large" [syn: ramify,
       branch]
    3: divide into two or more branches so as to form a fork; "The
       road forks" [syn: branch, ramify, fork, furcate,
       separate]

Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "ramify":
   accelerate, aggravate, ball up, beef up, bifurcate, bisect,
   blow up, branch, branch out, by two, cleave, complicate,
   concentrate, condense, confound, confuse, consolidate, cut in two,
   deepen, deploy, dichotomize, dimidiate, disperse, divaricate,
   divide, double, embrangle, enhance, entangle, exacerbate,
   exaggerate, expand, extend, fan, fan out, fission, flare, fork,
   foul up, furcate, halve, heat up, heighten, hop up, hot up,
   implicate, in half, intensify, involve, jazz up, key up, knot,
   louse up, magnify, make complex, mess up, mix up, muck up, muddle,
   open, open up, outspread, outstretch, overgrow, overrun, perplex,
   ravel, redouble, reinforce, screw up, sharpen, snarl, snarl up,
   soup up, splay, split in two, spraddle, sprangle, sprawl, spread,
   spread like wildfire, spread out, stem, step up, strengthen,
   subdivide, tangle, transect, trifurcate, triple, unfold, whet,
   widen