The word "gossamer" comes from Middle English, where it originally meant "goose summer",  likely because of the fine, goose-down-like appearance of the spiderwebs seen in late autumn, or because the webs appeared during this mild, late-fall period.  The word gossomer was formed by combining the words gos ("goose") and somer ("summer") and may have first referred to the season itself, a mild spell in late autumn ("Indian summer") when geese were traditionally eaten.  The term was initially used for the filmy cobwebs themselves, but later the original noun eventually evolved to its current use as an adjective for things that are light, flimsy, delicate, or tenuous.  

According to the Oxford English Dictionary (OED), the word "gossamer" was first used in English around 1325, during the Middle English period.  

Examples of "gossamer" used in a sentence: 
"It looked to have been crafted from gossamer, or light itself." 
"Her hair had drifted through his fingers like gossamer." 
"it's thin and wispy, like freshly spun gossamer" 
"The shape of fairy wings vary from a moth's wings to a butterfly to gossamer bird -like wings that flare upwards. 
"Your little girl will likely have a say in what her holiday dress should look like, and chances are she will choose something spectacularly gossamer." 
"It soon became the norm for fairies to be pictured as the size of buttercups and daisies, flitting about on gossamer wings and hiding under toadstools." 
"The construction of Hampton Bay fans includes the addition of Gossamer Wind blades as the brand name for every fan."

Just the facts:

GOSSAMER Definition & Meaning - Merriam-Webster

GOSSAMER Synonyms: 92 Similar and Opposite Words | Merriam-Webster Thesaurus