Pyrrhus Syllabification: (Pyr·rhus)Pronunciation: /ˈpirəs/Definition of Pyrrhus (circa 318–272 bc), king of Epirus circa 307–272. After invading Italy in 280, he defeated the Romans at Asculum in 279, but sustained heavy losses; the term pyrrhic victory alludes to this. Pyrrhus in other Oxford dictionaries Definition of Pyrrhus in the British & World English dictionary