myEtymology.com: English etymology of erstwhile

Etymology of the English word erstwhile

the English word erstwhile

derived from the English word erst

derived from the English word rest

derived from the Proto-Indo-European root *bhru-

derived from the Proto-Germanic root *rastjo

derived from the Proto-Indo-European root *ayer-

derived from the English word while

derived from the Proto-Germanic root *khwilo

derived from the Proto-Indo-European root *kʷeiə-