Whit·sun /ˈhwɪtsən, ˈwɪt-/
  (a.)降靈節的
  Whit·sun a. Of, pertaining to, or observed at, Whitsuntide; as, Whitsun week; Whitsun Tuesday; Whitsun pastorals.
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  Whitsun
       n : Christian holiday; the week beginning on Whitsunday
           (especially the first 3 days) [syn: Whitsuntide, Whitweek]