Whitsun n 1: Christian holiday; the week beginning on Whitsunday (especially the first 3 days) [syn: {Whitsun}, {Whitsuntide}, {Whitweek}]
Whitsun \Whit"sun\, a. Of, pertaining to, or observed at, Whitsuntide; as, Whitsun week; Whitsun Tuesday; Whitsun pastorals. [1913 Webster]