A catenary is the sag in a line strung between two points; a curve into which a uniform rope or cable falls when suspended from two points, as in a suspension bridge; the structure of cables above the track which carries the electric supply for electric locomotives that use overhead electricity .
(My Christmas cards hang on a string which sags in the middle with their weight - so they end up all piled up together in the catenary!)
You've proven it! There is, indeed, a word for everything! :)
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