Having two threads, wires, or filaments; composed of or involving two strands.
From Latin 'bi-' (two) plus 'filum' (thread). The term emerged in scientific contexts in the 19th century, particularly in physics and engineering where precision instruments use twin filaments.
A 'bifilar pendulum' is a physics classic—suspending a weight from two wires instead of one lets you measure incredibly tiny rotational movements, and this simple two-wire design changed how scientists took precise measurements.
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