snow fly

noun
variants: or

snow insect

Definition of snow fly

  1. 1 :  any of several minute insects that constitute a genus (Boreus) of the order Mecoptera and sometimes appear on the snow in great numbers and in the males have vestigial wings but in the female are wingless

  2. 2 :  any of several small American stone flies (especially Taeniopteryx nivalis or Capnella pygmaea) often seen on snow

  3. 3 :  snow gnat

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