'Hard grass' definitions:
Definition of 'Hard grass'
From: GCIDE
- Hard grass \Hard" grass`\ (gr[.a]s`). (Bot.) A name given to several different grasses, especially to the {Roltb["o]llia incurvata}, and to the species of Aegilops, from one of which it is contended that wheat has been derived. [1913 Webster]