venefic

venefic

(vɪˈnɛfɪk) ,

veneficious

or

veneficous

adj
obsolete having poisonous effects
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
Absorbed very quickly, the venefic substance enters the blood stream and produces in its victim a frightening feeling of suffocation, accompanied by very real difficulties in breathing, convulsions, and an appalling sense of dread.
Maybrick, himself a murderer -- he fell victim to the venefic practices of his young wife -- is on the face of it an unlikely nomination for the role of Ripper, and I harbour grievous doubts in regard to the validity of his candidature.