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From The Collaborative International Dictionary of English v.0.48:
Yom \Yom\, n. [Heb. y[=o]m.] Day; -- a Hebrew word used in the names of various Jewish feast days; as, Yom Kippur, the Day of Atonement; Yom Teruah (lit., day of shouting), the Feast of Trumpets. [Webster 1913 Suppl.]