ḱwey-tó-₂
“shining, holy, bright”white, wheat, Whitsunday
Participial of *ḱwey- yielding English white, wheat, Whitsunday from shining/pure sense.
Discussion
The form *ḱwey-tó- is a participial adjective from the root *ḱwey- "to shine, to be white, to gleam," formed with the familiar *-tó- suffix that marks the result of a verbal action — hence "having come to shine, bright, white." Pokorny (IEW 628–629) establishes the root under *k̑uei- with reflexes pointing consistently to whiteness and luminosity, while Rix (LIV² 344) refines the reconstruction with the palatal stop that conditions the characteristic sibilant developments in the satem languages.
English white is the most direct Germanic reflex, continuing a Proto-Germanic *hwītaz that preserves both the palatal-to-velar shift and the participial suffix. Wheat likewise belongs here, named for the pale color of its grain — the white cereal, distinguished from darker varieties. Whitsunday, the English name for Pentecost, refers to the white garments worn by the newly baptized, binding the ancient color word to a Christian liturgical moment.
In the satem languages, the palatal *ḱ yields a sibilant: Sanskrit śvetá- "white, bright" is a precise formal match to the reconstructed *ḱwey-tó-. Old Church Slavonic světŭ "light, world" carries the same root into Slavic, where it underwent a profound semantic expansion — from physical brightness to the illuminated world itself, so that the word for light became a word for the cosmos.
This semantic trajectory from shining to holy recurs across Indo-European cultures with striking regularity. What is bright is pure; what is pure is sacred; what is sacred illuminates. The root *ḱwey- thus traces a path from the simple perception of reflected light on pale surfaces to the metaphysical conviction, shared by Vedic priests and Germanic converts alike, that holiness and radiance are one and the same.