An insect of the mayfly order (Ephemeroptera) with grey-colored wings, commonly used as bait in fly fishing.
Compound from 'grey' plus 'fly,' a descriptive name for mayfly species. Greyflies are particularly important in fishing folklore and are matched carefully by anglers to seasonal insect hatches.
Mayflies are ecologically crucial as the primary food for trout and salmon, and the hatching times are so important to fishing culture that fly fishermen actually plan vacations around specific weekly hatches that happen every year like clockwork.
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