Source : Webster's Revised Unabridged Dictionary (1913)

Offshoot \Off"shoot`\, n. [Off + shoot.]
   That which shoots off or separates from a main stem, channel,
   family, race, etc.; as, the offshoots of a tree.

Source : WordNet®

offshoot
     n : a natural consequence of development [syn: {outgrowth}, {branch},
          {offset}]