wheat: the cereal grain harvested for bread, and by extension grain as a stored or traded food staple
This is the everyday word for wheat, the cereal grain that made the finest bread of the ancient world. It follows wheat through its whole life: sown as a single kernel, grown as a standing crop, harvested, and threshed to separate the good grain from the worthless chaff (ἄχυρον).
Wheat also stands at the center of some of the New Testament's most vivid pictures. A single seed (κόκκος) of wheat must fall into the ground and die before it can bear a harvest (John 12:24). Jesus warns Peter that Satan has asked to sift the disciples like wheat (Luke 22:31). And in the story of the weeds, a look-alike weed (ζιζάνιον) is sown among the wheat, so that pulling it up early would tear out the wheat as well.
Once gathered, the same wheat becomes a measured commodity: grain heaped in a rich man's barns (Luke 12:18), a debt counted in measures of wheat (Luke 16:7), a grain cargo dumped overboard to save a ship (Acts 27:38), and a costly staple weighed against cheaper barley (κριθή) when famine drives up the price (Revelation 6:6).