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carillon (n.)

"set of tuned, stationary bells sounded by means of a keyboard or other machinery," 1775, from French carillon, which, according to French sources, is from Old French carignon "set of four bells," an alteration of quarregon, from Vulgar Latin *quadrinionem, from Latin quaternionem "set of four," from quater "four times," from PIE *kwetrus, from root *kwetwer- "four."