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Definition of Ash wednesday
1. Noun. The 7th Wednesday before Easter; the first day of Lent; the day following Mardi Gras ('Fat Tuesday'); a day of fasting and repentance.
Medical Definition of Ash wednesday
1. The first day of Lent; so called from a custom in the Roman Catholic church of putting ashes, on that day, upon the foreheads of penitents. Source: Websters Dictionary (01 Mar 1998)