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plural coleopters
(zoology) One of the Coleoptera; a beetle.
A type of VTOL aircraft which uses a ducted fan as the primary fuselage of the entire aircraft. quotations examples
But the coleopter, with its tubular wing, belongs in a class by itself.
1955 May, “Why You May Fly in a Barrel”, in Popular Science, volume 166, number 5, page 100