We found 2 dictionaries that define the word grain fields:

General (2 matching dictionaries)

1. grain fields: Vocabulary.com
2. grain-fields: Wordnik

(Note: See grain_field as well.)

Definitions from WordNet (grain field) ▸ noun:  a field where grain is grown ▸ Also see grain_field ▸ Words similar to grain fields ▸ Usage examples for grain fields ▸ Idioms related to grain fields ▸ Wikipedia articles (New!) ▸ Words that often appear near grain fields ▸ Rhymes of grain fields ▸ Invented words related to grain fields