Hebrew עֹמֶר. Literally "a sheaf". Also called Sheaf.
A tenth of an ephah: one person's daily ration of manna.
Volume (dry)
2–2.4 L (2.11–2.54 qt).
Defined as 1/10 of a ephah.
Inherits the disagreement over the ephah.
The omer is defined in scripture for one reason — it is the measure of manna each person gathered, and Exodus stops to explain it because the unit was already unfamiliar when the account was written down. A jar of one omer was kept before the ark as a memorial. It is not the homer, which is a hundred times larger.
Each basket holds its measure at the middle of the range above. The ephah is the anchor: a seah is a third of it, an omer a tenth and a cab an eighteenth, and ten ephahs make a homer, the word for a donkey’s load. An omer of manna, a day’s food for one person (Exodus 16:16), is about a 2-litre bottle’s worth.