In a bifilar manner; using or involving two threads or filaments.
From 'bifilar' plus the adverbial suffix '-ly.' This technical adverb describes the manner or method of arrangement using twin filaments or threads.
In scientific papers, you might see 'bifilarly wound' describing how a coil is wound with two wires together—it's the kind of word that sounds complex but just means 'two-stringed arrangement'.
Complete word intelligence in one call. Free tier — 50 lookups/day.