GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Bifilar , a. [Pref. bi- + filar.] Two-threaded; involving the use of two threads; as, bifilar suspension; a bifilar balance.
   1913 Webster
   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.
   1913 Webster