Basic Guidelines For English Spellings
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That works wonders; exciting wonder or astonishment; marvellous. Also (humorously) in weakened sense.
Late 15th century; earliest use found in William Caxton (1415x24–1492), printer, merchant, and diplomat. From Middle French, French mirifique causing wonder or admiration, amazing and its etymon classical Latin mīrificus from mīrus wonderful + -ficus.