Etymology
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caries (n.)

1630s, "destructive disease of bone," from Latin caries "rottenness, decay," from Proto-Italic *kas-, usually said to be from PIE root *kere- "to injure, break apart" (source also of Greek ker "death, destruction," Old Irish krin "withered, faded"). Related: Carious. But de Vaan writes that "semantically, caries may just as well belong to careocared 'to lack' as 'defect, state of defectiveness' ...." Of teeth by 1826.

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Definitions of caries

caries (n.)
soft decayed area in a tooth; progressive decay can lead to the death of a tooth;
Synonyms: cavity / dental caries / tooth decay
From wordnet.princeton.edu