ELECTRUM
electrum
(noun) an alloy of gold and silver
Source: WordNet® 3.1
Etymology
Noun
electrum (countable and uncountable, plural electrums)
(obsolete) Amber.
An alloy of gold and silver, used by the ancients; now specifically a natural alloy with between 20 and 50 per cent silver.
German silver plate.
Source: Wiktionary
E*lec"trum, n. Etym: [L., fr. Gr. Electric, and cf. Electre,
Electron.]
1. Amber.
2. An alloy of gold and silver, of an amber color, used by the
ancients.
3. German-silver plate. See German silver, under German.
Source: Webster’s Unabridged Dictionary 1913 Edition