grey sedge

noun

British an angler's name for a greyish caddis fly, Odontocerum albicorne, that frequents running water, in which its larvae make cases from grains of sand

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