bi·fi·lar | \ (ˌ)bī-ˈfī-lər 
\
\Definition of bifilar
1 : involving two threads or wires
bifilar suspension of a pendulum
2 : involving a single thread or wire doubled back upon itself
a bifilar resistor
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Time Traveler for bifilar
The first known use of bifilar was in 1846
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