OMER — a dry measure, roughly two liters, a tenth of an ephah (v36). ⚠ The same word, from the same root meaning 'a heap,' also names an ordinary SHEAF of grain (Leviticus 23:10-15; Ruth 2:7) — one lexical entry doing double duty as both a bundle in a field and a fixed unit of volume. Its afterlife is calendrical: Leviticus 23:15-16 commands counting fifty days from the first omer of harvest to Pentecost, a count still kept today as 'the Counting of the Omer' — a ritual with nothing to do with manna, borrowing only the measure's name from this chapter's daily ration. → first discussed at Exod 16:16