quality:correction, quality:corruption
Etymology

The word comes from Latin calculus ' small stone ', from calx ' limestone, lime ', probably related to Greek χάλιξ chalix ' small stone, pebble, rubble ', which many trace to a Proto-Indo-European root for ' split, break up '. Calculus was a term used for various kinds of stones. This spun off many modern words, including calculate (' use stones for mathematical purposes '), and calculus, which came to be used, in the 18th century, for accidental or incidental mineral buildups in human and animal bodies, like kidney stones and minerals on teeth.