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Webster 1913 Edition

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Adj.

Acting by poison; used in poisoning or in sorcery.

[Obs.]

“An old veneficious practice.”

Sir T. Browne.

–

Venˊe-fi′cious-ly

adv.

[Obs.]

veneficious ‎(comparative more veneficious, superlative most veneficious)

(obsolete) Acting by poison; used in poisoning or sorcery.
- Sir Thomas Browne
  An old veneficious practice.