carenumEtymologyFrom Latin carēnum or caroenum, from Ancient Greek κάροινον (károinon), q.v.carenum means A reduction of must or sweet wine produced by boiling it in large kettles until it was reduced by half or two-thirds in volume. Lexicurio rates it Rare gem — a strength score of 83 out of 100.nounA reduction of must or sweet wine produced by boiling it in large kettles until it was reduced by half or two-thirds in volume.