noun

1. An alloy of copper and nickel whose resistivity is constant over a wide temperature range

Synonyms: eureka

interjection

1. An exclamation indicating sudden discovery.

   “1821: 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. — Byron, Don Juan, 1821”