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The Collaborative International Dictionary
Fascinous

Fascinous \Fas"ci*nous\, a. [L. fascinum witchcraft, akin to fascinare. See Fascinate.] Caused or acting by witchcraft. [Obs.] ``Fascinous diseases.''
--Harvey.

Douglas Harper's Etymology Dictionary
fascinous

"caused by witchcraft," 1660s, from Latin fascinum "charm, enchantment, witchcraft" (see fascinate) + -ous.

Wiktionary
fascinous

a. (context obsolete English) Caused or acting by witchcraft.