Eureka (i.e. I have found it), the exclamation of Archimedes on discovering how to test the purity of the gold in the crown of Hiero (q.v.); he discovered it, tradition says, when taking a bath.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Eure-et-Loir * Euripides