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The Collaborative International Dictionary
Usurary

Usurarious \U`su*ra"ri*ous\, Usurary \U"su*ra*ry\, a. [L. usurarius that serves for use, that pays interest. See Usurer.] Usurious. [Obs.] ``Usurarious contracts.''
--Jer. Taylor. Bp. Hall.

Wiktionary
usurary

a. (context obsolete English) usurious#English.