a thin, lightweight, translucent, glazed paper, used especially for making carbon copies.

1875–80, Americanism; onion + skin

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World English Dictionary
onionskin (ˈʌnjənˌskɪn)
a glazed translucent paper

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Its onionskin pages were stained with grease from his fingers.
Onionskin and mimeographed memoranda concerning labor relations.
Observe the onionskin under the low power of the microscope.
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