It seems best to connect carcer with other IE words for 'circle, round object', such as Latin. curvus, Gr. κιρκος 'ring', OIc. hringr, although not all of these have a good IE etymology. The reduplication in Latin carcer could be iconic; thus, the original meaning would have been 'enclosure'. [de Vaan]
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[ incarceration 造句 ]