Definition of omer
1 : an ancient Hebrew unit of dry capacity equal to 1⁄10 ephah
2a often capitalized : the sheaf of barley traditionally offered in Jewish Temple worship on the second day of the Passoverb capitalized : a 7-week liturgical period of anticipation for Shavuot beginning with the second day of the Passover
Origin and Etymology of omer
First Known Use: 1560
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