winteryoudaoicibaDictYouDict[winter 词源字典]
winter: [OE] Winter is a general Germanic word (German and Dutch spell it the same, Swedish and Danish have vinter). Its prehistoric ancestor was *wentrus, but the ultimate source of this is uncertain. It could well go back to a nasalized version of the Indo-European base *wed-, *wod-, *ud- ‘wet’ (source also of English otter, water and wet), in which case winter would be etymologically the ‘wet’ season. But an alternative theory traces it back to Indo- European *wind- ‘white’ (source of Breton gwenn, Welsh gwyn – which may underlie English penguin – and Irish fionn ‘white’), in which case it would denote the ‘white’ season.
[winter etymology, winter origin, 英语词源]
winter (n.)youdaoicibaDictYouDict
Old English winter (plural wintru), "the fourth and coldest season of the year, winter," from Proto-Germanic *wintruz "winter" (cognates: Old Frisian, Dutch winter, Old Saxon, Old High German wintar, German winter, Danish and Swedish vinter, Gothic wintrus, Old Norse vetr "winter"), probably literally "the wet season," from PIE *wend-, from root *wed- (1) "water, wet" (see water (n.1)). On another old guess, cognate with Gaulish vindo-, Old Irish find "white."

As an adjective in Old English. The Anglo-Saxons counted years in "winters," as in Old English ænetre "one-year-old;" and wintercearig, which might mean either "winter-sad" or "sad with years." Old Norse Vetrardag, first day of winter, was the Saturday that fell between Oct. 10 and 16.
winter (v.)youdaoicibaDictYouDict
"to pass the winter (in some place)," late 14c., from winter (n.). Related: Wintered; wintering.