Source : Webster's Revised Unabridged Dictionary (1913)

Unifilar \U`ni*fi"lar\, a. [Uni- + L. filum a thread.]
   Having only one thread; involving the use of only one thread,
   wire, fiber, or the like; as, unifilar suspension.

   {Unifilar magnetometer} (Physics), an instrument which
      consists of a magnetic bar suspended at its center of
      gravity by a long thread, constituting a delicate means
      for accurately measuring magnetic intensities, also for
      determining declinations of the magnetic needle.

Source : WordNet®

unifilar
     adj : having or using only one filament