Definition of small grain in English:

small grain

Pronunciation /ˈsmɔːl ɡreɪn/

noun

North American Farming
  • As a mass noun: cereals having a small grain head, such as wheat, barley, oats, etc., especially (in later use) in contrast to larger row crops such as maize. Also (as a count noun): a type of such cereal.

adjective

North American Farming
  • Of or relating to small grain; suitable for or planted with small grain.

Origin

Mid 17th century. From small + grain.