1. noun /ɡɹeɪn/
We stored a thousand tons of grain for the winter.
b) A single seed of grain.
a grain of wheat
See Also: coarse-grained, fine-grained, grosgrain, granary, granular, granularity, granulate, granulation
2. verb /ɡɹeɪn/
a) To feed grain to.
Wikipedia foundation.