subimago

/ (ˌsʌbɪˈmeɪɡəʊ) /

noun plural -imagoes or -imagines (-ɪˈmædʒəˌniːz)

the first winged stage of the mayfly, with dull opaque wings, known to anglers as a dun, before it metamorphoses into the shiny gauzy imago or spinner See also dun 2 (def. 3), spinner (def. 6)

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