The Collaborative International Dictionary of English v.0.48:

Subdivide \Sub`di*vide"\, v. t. [imp. & p. p. Subdivided; p.
   pr. & vb. n. Subdividing.] [L. subdividere, sub under +
   dividere to divide. See Divide.]
   To divide the parts of (anything) into more parts; to part
   into smaller divisions; to divide again, as what has already
   been divided.
   [1913 Webster]

         The progenies of Cham and Japhet swarmed into colonies,
         and those colonies were subdivided into many others.
                                                  --Dryden.
   [1913 Webster]