eureka

Etymology

From Ancient Greek εὕρηκα (heúrēka, “I have found”), perfect active indicative first singular of εὑρίσκω (heurískō, “to find”). Archimedes supposedly exclaimed this when he figured out how to find the density of an object.

intj

1. An exclamation indicating sudden discovery.
   Eureka! I have found it! What I mean / To say is, not that love is idleness, / But that in love such idleness has been / An accessory, as I have cause to guess. 1821, Byron, Don Juan
   A page is turned - eureka, a snatch of tune / is playing itself, the piss-proud syllables / are unveiling a difficult prosody. 1970, Peter Porter, The Sanitized Sonnets, The Last of England

noun

1. Synonym of constantan (“copper-nickel alloy”)