From Middle English winter, from Old English winter, from Proto-Germanic *wintruz (“winter”). Cognate with West Frisian winter (“winter”), Dutch winter (“winter”), German Winter (“winter”), Danish, Swedish and Norwegian vinter (“winter”), Icelandic vetur (“winter”).
From Dutch winter.
From Proto-Germanic *wintruz.
From Proto-Germanic *wintruz, whence also Old Frisian winter, Old High German and Old Saxon wintar, Old Norse vetr and vintr, Gothic 𐍅𐌹𐌽𐍄𐍂𐌿𐍃 (wintrus). Perhaps represents a nasalised variant of Proto-Indo-European *wed- (whence also English water, wet); but perhaps akin to Old English winistre (“left (side)”), with original sense possibly a cardinal direction or possibly "unfavorable" .