Etymology From Biblical Hebrew עומר / עֹמֶר ('ómer, “sheaf”).
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Units of measureHistorical A former small Hebrew unit of dry volume equal to about 2.3 L or 2.1 quarts.
...that Omer which was every mans daily portion of Manna, is computed to have bin more then might have well suffic'd the heartiest feeder thrice as many meals.1644, John Milton, Areopagitica:
And it came to pass, that on the sixth day they gathered twice as much bread, two omers for one man: and all the rulers of the congregation came and told Moses.1769, Bible (KJV), Exodus XVI
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A vessel of one omer.
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Judaism The sheaf of barley offered on the second day of Passover.
Omer
noun
Etymology Variant of omer
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Judaism, Usually, With 'the' The 49-day period from the second day of Passover to Shavuot, begun and ended with an offering of a sheaf of barley and noted nightly during evening prayer.
The counting of the Omer—the Sefiras HaOmer—is a mitzvah.
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Judaism, Alternative Alternative form of omer: the sheaf of barley offered on the second day of Passover.