Grain is a small, dry fruit of a cereal grass containing a single seed. Typically using as ingredients in other dishes such as bread. Such cereal grasses have evolved on Earth and Bajor (DS9 : Dramatis Personae), inhabitants of both planets grow cereal grasses and harvest grain along with many others such as Sherman's Planet. (TOS: "The Trouble with Tribbles"; TAS: "More Tribbles, More Troubles")
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