Bifilar is an uncommon word that is used to describe a system that has two threads or wires. However, there are several synonyms that can be used in place of this word to better convey the intended meaning. Some of these synonyms include "double-stranded," "dual-threaded," "twin-wire," "dual-cored," and "two-ply." All of these terms are interchangeable with "bifilar" and can be used to describe any system, machine, or object that contains two parallel threads or wires. It is always important to choose the right word to convey the intended meaning accurately, and these synonyms for "bifilar" offer a variety of options for doing just that.