BIFILAR
bifilar
(adjective) having or using two filaments; “a bifilar suspension of a waving part of an instrument”
Source: WordNet® 3.1
Etymology
Adjective
bifilar (not comparable)
Having two wires, threads or filaments
Source: Wiktionary
Bi*fi"lar, a. Etym: [Pref. bi- + filar.]
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition