(ˈ)bī+ adjective
Etymology: International Scientific Vocabulary bi- (I) + fil- (from Latin filum thread) + -ar — more at file
1. : composed of or employing two threads or wires
a bifilar suspension of a waving part of an instrument
2. : composed of or employing a single thread or wire doubled back upon itself
bifilar winding of a resistance coil
• bi·filarly adverb