noun
a fine, filmy substance consisting of cobwebs spun by small spiders, which is seen especially in autumn
adjective
light, delicate, and insubstantial
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The gossamer wings of the butterfly shimmered in the sunlight.
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She wore a gossamer scarf that fluttered in the breeze.
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That dress is so gossamer, it's like wearing air.
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His argument was based on gossamer evidence, easily torn apart.