stiffener

[ stif-uh-ner, stif-ner ]
/ ˈstɪf ə nər, ˈstɪf nər /

noun

a person or thing that stiffens.
any substance, as starch or buckram, that serves to stiffen fabric.

Origin of stiffener

First recorded in 1690–1700; stiffen + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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