eureka
Concise Oxford English Dictionary © 2008 Oxford University Press:
eureka /ˌjʊ(ə)ˈriːkə/
▶exclamation a cry of joy or satisfaction when one finds or discovers something. ▶noun an alloy of copper and nickel used for electrical filament and resistance wire.
– origin C17: from Gk heurēka ‘I have found it’, said to have been uttered by Archimedes when he hit upon a method of determining the purity of gold.
'eureka' also found in these Oxford entries:
