The omer (Hebrew: עֹ֫מֶר‎ 'ōmer) is an ancient Israelite unit of dry measure used in the era of the Temple in Jerusalem. It is used in the Bible as an ancient unit of volume for grains and dry commodities, and the Torah mentions as being equal to one tenth of an ephah.

What does Omer in the Bible mean?

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 Passover.

What is the meaning of Lag BaOmer?

Lag BaOmer is Hebrew for "33rd [day] in the Omer".