'Grain' in the Bible

Ornan said to David, “Take it for yourself; and let my lord the king do what is good in his sight. See, I will give the oxen for burnt offerings and the threshing sledges for wood and the wheat for the grain offering; I will give it all.”

and with the showbread, and the fine flour for a grain offering, and unleavened wafers, or what is baked in the pan or what is well-mixed, and all measures of volume and size.