Origins
The word 'white' traces an unbroken line of descent from Proto-Indo-European to the present day, making it one of the most ancient colour terms in English. It comes from Old English 'hwīt,' from Proto-Germanic *hwītaz, itself from the PIE root *ḱweyd- meaning 'bright, shining, white.' The word's original sense was not merely a colour but luminosity itself — whiteness conceived as the property of shining or radiating light.
The most immediately noticeable feature of 'white' is its initial consonant cluster. Old English 'hwīt' began with /hw/, a voiceless labio-velar approximant written 'hw' in Old English and reversed to 'wh' in Middle English by Norman scribal convention. This /hw/ pronunciation survived in standard English until roughly the eighteenth century and persists today in Scottish English, Irish English, and some Southern American dialects, where 'white' and 'wite,' 'which' and 'witch' remain distinct. In most modern English dialects, the distinction has been lost: 'white' is simply /waɪt/.
Cognates in the Germanic family are regular: German 'weiß' (from Old High German 'wīz'), Dutch 'wit,' Swedish 'vit,' Danish 'hvid,' Norwegian 'hvit,' Icelandic 'hvítur,' and Gothic 'hweits.' All descend from Proto-Germanic *hwītaz through predictable sound changes.
Proto-Indo-European Roots
Outside Germanic, the PIE root *ḱweyd- produced Sanskrit 'śvetá' (white, bright), which gives the Indic languages their word for white — Hindi 'safed' is not from this root, but the learned form 'śveta' survives in Indian proper names and in the name of the mythological 'Śvetadvīpa' (White Island). Old Church Slavonic 'světŭ' meant 'light' or 'world' (the world as the illuminated realm), surviving in Russian 'свет' (svet, light) and 'светлый' (svetly, bright). Lithuanian 'šviẽsti' means 'to shine,' providing another regular reflex of the PIE root.
An unexpected English relative of 'white' is 'wheat.' Old English 'hwǣte' (wheat) derives from Proto-Germanic *hwaitijaz, formed from the root *hwīt- with a suffix, because wheat flour was conspicuously pale compared to other cereal grains available to early Germanic peoples. Wheat was, in effect, 'the white grain.' This etymology has been accepted since at least the nineteenth century and is well supported by comparative evidence.
The phonological development from Old English 'hwīt' to Modern English 'white' /waɪt/ involves the Great Vowel Shift. The Old English long vowel /iː/ shifted to the diphthong /aɪ/ during the fifteenth to seventeenth centuries, the same change that affected 'time' (from Old English 'tīma'), 'life' (from 'līf'), and hundreds of other words. The final '-e' in 'white' is a relic of the Old English inflectional system and has been silent since late Middle English.
Figurative Development
Semantically, 'white' carries strong symbolic associations in English and across European culture: purity, innocence, cleanliness, and in some contexts, blankness or absence. A 'white flag' signals surrender. 'White-collar' (coined by Upton Sinclair in the 1930s) describes office work, from the white shirts traditionally worn by clerical workers. 'Whitewash' can mean both literal application of lime wash and figurative concealment of wrongdoing. 'White elephant' — a costly but useless possession — derives from the alleged Siamese royal practice of gifting rare white elephants to disfavoured courtiers, whose upkeep would ruin them.
Whitsunday (White Sunday), the English name for Pentecost, takes its name from the white baptismal robes worn by converts on that day, linking 'white' to the earliest English Christian vocabulary. The word's association with purity and spiritual cleanliness is ancient in the Germanic tradition; Old English poetry frequently uses 'hwīt' to describe angels, heaven, and the righteous.