Webster's English Dictionary

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whitsunday

Whit.sun.day \-(.)s*n-de-, -'s*n-de-, -s*n-.da-\ n [ME Whitsonday, fr. OE 
   hwi-ta sunnandg, lit., white Sun]day; prob. fr. the custom of wearing 
   white robes by the newly baptized, who were numerous at this season : 
   PENTECOST