any of several grasses of the genus Arrhenatherum or Danthonia, especially A. elatius, native to Europe, having a purplish-green flowering panicle.
Origin of oat grass
First recorded in 1570–80
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Examples from the Web for oat grass
They now contained a most luxuriant crop of oat-grass (Anthistiria).Journal of an Expedition into the Interior of Tropical Australia|Thomas Mitchell
On the oat-grass and the sword-grass, and the bulrush in the pool.
British Dictionary definitions for oat grass
any of various oatlike grasses, esp of the genera Arrhenatherum and Danthonia, of Eurasia and N. Africa
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