Main Entry: ember day

Pronunciation: \ˈem-bər-\

Function: noun

Etymology: Middle English, from Old English ymbrendæg, from ymbrene circuit, anniversary + dæg day

Date: before 12th century

: a Wednesday, Friday, or Saturday following the first Sunday in Lent, Whitsunday, September 14, or December 13 set apart for fasting and prayer in Western churches