Definition of haver grass in English:

haver grass

noun

English Regional, Scottish, Northern
rare
  • Any of various grasses related to the cultivated oat (Avena sativa) or thought to resemble it.

Origin

Late 16th century; earliest use found in Henry Lyte (1529–1607), botanist and antiquary. From haver + grass.

Pronunciation

haver grass

/ˈheɪvə ˌɡras//ˈheɪvə ˌɡrɑːs/