eu ‧ re ‧ ka /jʊˈriːkə/ BrE AmE interjection humorous
[ Date: 1600-1700 ; Language: Greek ; Origin: heureka 'I have found' , said by the Greek scientist Archimedes when he discovered a method of testing the purity of gold ]
used to show how happy you are that you have discovered the answer to a problem, found something etc