Source : Webster's Revised Unabridged Dictionary (1913)

Subdivide \Sub`di*vide"\, v. i.
   To be, or to become, subdivided.

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.

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

Source : WordNet®

subdivide
     v 1: form into subdivisions; "The cells subdivided"
     2: divide into smaller and smaller pieces; "This apartment
        cannot be subdivided any further!"