Relating to, composed of, or resembling threads or filaments; used especially in scientific instruments involving fine wires.
From Latin 'filum' (thread) directly, with the suffix '-ar' (relating to). This term is common in physics and astronomy to describe instruments with fine wires.
A filar micrometer uses two fine wires to measure incredibly tiny distances—astronomers use them to measure the distance between stars, differences so small that comparing it to ordinary measurement would be like measuring the width of a human hair across an entire continent.
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