Nessus, A Centanre, which ranished Deianira Hercules wife: who being wounded to death, gaue to Deianira a poyson, wherewith Hercules shirt being washed, and put on him, his body did rotte with most horrible paynes, which he not sustaining, did enter into a great fire, and lette himselfe bee burned.
Lewis and Short: Latin dictionary
Nessus, i, m., = *ne/ssos. I.A river in Thrace, now the Mesto or (Turkish) Karasu, Liv. 45, 29, 6; also called Nestos ( = *ne/stos), Mel. 2, 2.—II.A Centaur, who, on offering violence to Dejanira, was slain by Hercules with a poisoned arrow, Ov. M. 9, 101 sq.; Hyg. Fab. 34.—Hence, III. Nessēus, a, um, adj., of Nessus: venenum,
with the blood of Nessus, poisoned by the arrow of Hercules
, Ov. H. 9, 163: palla tabe Nesseā illita, Sen. Herc. Oet. 716.