Definition: bifilar

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Source: WordNet (r) 1.7 

bifilar
     adj : having or using two filaments; "a bifilar suspension of a
           waving part of an instrument"

Source: Webster's Revised Unabridged Dictionary (1913) 

Bifilar \Bi*fi"lar\, a. [Pref. bi- + filar.]
   Two-threaded; involving the use of two threads; as, bifilar
   suspension; a bifilar balance.

   Bifilar micrometer (often called a bifilar), an
      instrument form measuring minute distances or angles by
      means of two very minute threads (usually spider lines),
      one of which, at least, is movable; -- more commonly
      called a filar micrometer.