ˈōmə(r) noun
( -s )
Etymology: Hebrew 'ōmer
1. : an ancient Hebrew unit of dry capacity equal to 1/10 ephah or about 1/2 peck
2. often capitalized
a. : a wave offering of a sheaf or omer measure of barley representing the first reaping of the grain harvest and presented to the priest in a temple ceremony on the second day of the Passover
b. : a period of seven weeks between the second day of the Passover and Shabuoth during which in traditional Judaism various restrictive laws (as the prohibition of festivities except on Rosh Hodesh and Lag b'Omer) are in force and each day is formally counted in the evening service
hast commanded us concerning the counting of the omer — Jewish Daily Prayer Book