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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Tiono make stiff; to make less pliant or flexible; as, to stiffen cloth with starch. Stiffen the sinews, summon up the blood. (Shak)

2. To inspissate; to make more thick or viscous; as, to stiffen paste.

3. To make torpid; to benumb.

Origin: See Stiff.