English

Whitsun

Apocopic form of Whitsunday.

A compound of white + Sunday

Proto-Indo-European *ḱweydós

Proto-Germanic *hwītaz

Proto-West Germanic *hwīt

Old English hwīt

Middle English whit ‘white’

English white

Proto-Germanic *dagaz ‘day’

Proto-West Germanic *dag ‘day’

Proto-West Germanic *Sunnōn dag

Old English sunnandæġ

Middle English Sonday

Today it means

noun Whitsunday.

Language periods are conventional ranges, not dates for this word.