Nessus

or Nes·sos

[ nes-uh s ]
/ ˈnɛs əs /

noun Classical Mythology.

a centaur who, on attempting to seduce Deianira, the wife of Hercules, was shot by Hercules with a poisoned arrow. Before Nessus died, he gave to Deianira the poisoned tunic that ultimately caused Hercules' death.
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British Dictionary definitions for nessus

Nessus

/ (ˈnɛsəs) /

noun

Greek myth a centaur that killed Hercules. A garment dipped in its blood fatally poisoned Hercules, who had been given it by Deianira who thought it was a love charm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012