Lag b'O·mer (läg bōmər, läg′ bə-ōmĕr) or Lag ba'O·mer (läg′ bə-ōmĕr)
A Jewish feast celebrated on the 33rd day of the Omer (the 18th day of Iyar).
[Mishnaic Hebrew lag bā-'ōmer : lag, conventional pronunciation of lg, the number 33 when written with the Hebrew letters lamedh (having the numerical value 30) and gimel (having the numerical value 3) + bā, in the (bə, in + hā, the) + 'ōmer, the Omer; see OMER.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.