Source : Webster's Revised Unabridged Dictionary (1913)

Subcommittee \Sub`com*mit"tee\, n.
   An under committee; a part or division of a committee.

         Yet by their sequestrators and subcommittees abroad . .
         . those orders were commonly disobeyed.  --Milton.

Source : WordNet®

subcommittee
     n : a subset of committee members organized for a specific
         purpose