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British Dictionary definitions for spent gnat

spent gnat

noun
  1. an angler's name for the spinner of various mayflies, esp Ephemeris danica and E. vulgata, particularly when lying spent on the water surface after mating and egg-laying
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012