A Jewish feast celebrated on the 33rd day of the Omer (the 18th day of Iyar).
A Jewish holiday observed on the 18th day of Iyar.
Origin of lag-b-omer
- Mishnaic Hebrew lag bā-‘ōmer lag 33rd (from the numerical values of the letters l 30) (g 3) bā in the (bə in) (hā the) ‘ōmer the Omer omer
From American Heritage Dictionary of the English Language, 5th Edition