1. having or using two filaments; - Example: "a bifilar suspension of a waving part of an instrument"
The Collaborative International Dictionary of English v.0.48:
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.
WordNet (r) 3.0 (2006):
adj 1: having or using two filaments; "a bifilar suspension of a
waving part of an instrument"