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lyme grass

British  
/ laɪm /

noun

  1. a N temperate perennial dune grass, Elymus arenarius, with a creeping stem and rough bluish leaves

"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

Etymology

Origin of lyme grass

C18: probably a respelling (influenced by its genus name, Elymus ) of lime 1 , referring to its stabilizing effect (like lime in mortar)