One of the mysteries of the English language finally explained.
Attributive, especially in "Oropesa float", "Oropesa sweep". Designating a minesweeping method or device developed and tested on the Oropesa, or apparatus employed in this.
1930s; earliest use found in War Illustrated. From Oropesa, the name of a trawler used as a minesweeper by the Royal Navy in the First World War on which this method of minesweeping was developed and tested.
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