bifilar
adjective
bi·fi·lar (ˌ)bī-ˈfī-lər 
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
bifilarly adverb
Word History
Etymology
International Scientific Vocabulary bi- + Latin filum thread — more at file
First Known Use
1846, in the meaning defined at sense 1