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Latin word libro comes from Latin -one(-onem|m), Latin libra
-one(-onem|m) (Latin)
libra (Latin)
A Roman unit of measure, equal to twelve ounces; a pound (abbreviated lb.). A level (a device for making horizontal). A pair of scales, balance.
libro (Latin)
(figuratively) I consider, weigh, ponder. I poise, balance. I swing, brandish, hurl, cast, fling.