ochel mi-toch pesolet (pesoles) -- choosing what you want from what you don't want
olam haba -- the world to come
Omer -- the counting of 49 days from Passover until Shavuot (“Sefirat HaOmer”); also refers to the barley offering brought in the times of the Temple
Onkelos -- Aramaic translation of the Bible, authored by a nephew of a Roman emperor, who converted to Judaism
opheh -- baking/roasting -- using the medium of hot air
Orach Chaim -- section of Shulchan Aruch (Code of Jewish Law) dealing with daily laws, Shabbat and holidays
oreig -- weaving; one of the 39 primary categories of forbidden Shabbat activity
