gossamer.

From Middle English gossomer, gosesomer, gossummer (attested since around 1300, and only in reference to webs or other light things), usually thought to derive from gos (“goose”) + somer (“summer”) and to have initially referred to a period of warm weather in late autumn when geese were eaten — compare Middle Scots goesomer, goe-summer (“summery weather in late autumn; St Martin's summer”) and dialectal English go-harvest, both later connected in folk-etymology to go — and to have been transferred to cobwebs because they were frequent then or because they were likened to goose-down. Skeat says that in Craven the webs were called summer-goose, and compares Scots and dialectal English use of summer-colt in reference to "exhalations seen rising from the ground in hot weather". Weekley notes that both the webs and the weather have fantastical names in most European languages: compare German Altweibersommer (“Indian summer; cobwebs, gossamer”, literally “old wives' summer”) and other terms listed there.

From Middle English gossomer, gosesomer, gossummer (attested since around 1300, and only in reference to webs or other light things), usually thought to derive from gos (“goose”) + somer (“summer”) and to have initially referred to a period of warm weather in late autumn when geese were eaten — compare Middle Scots goesomer, goe-summer (“summery weather in late autumn; St Martin's summer”) and dialectal English go-harvest, both later connected in folk-etymology to go — and to have been transferred to cobwebs because they were frequent then or because they were likened to goose-down. Skeat says that in Craven the webs were called summer-goose, and compares Scots and dialectal English use of summer-colt in reference to "exhalations seen rising from the ground in hot weather". Weekley notes that both the webs and the weather have fantastical names in most European languages: compare German Altweibersommer (“Indian summer; cobwebs, gossamer”, literally “old wives' summer”) and other terms listed there.