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The Collaborative International Dictionary
Pergamentaceous

Pergamenous \Per`ga*me"no*us\, Pergamentaceous \Per`ga*men*ta"ceous\, a. [L. pergamena parchment. See Parchment.] Like parchment.

Wiktionary
pergamentaceous

a. (context biology now chiefly botany English) reminiscent of parchment.