Miraculous

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late Middle English: from French miraculeux or medieval Latin miraculosus, from Latin miraculum (see miracle).

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From Middle French miraculeux

etymonline

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miraculous (adj.)

"exceedingly surprising or wonderful; of the nature of a miracle," mid-15c., from Old French miraculos (Modern French miraculeux), from Medieval Latin miraculosus, from Latin miraculum "miracle, marvel, wonder" (see miracle). Related: Miraculously (early 15c.); miraculousness.