mid-14c., "ambergris, perfume made from ambergris," from Old French ambre, from Medieval Latin ambar "ambergris," from Arabic 'anbar "ambergris." In Europe, the sense was extended, inexplicably, to fossil resins from the Baltic (late 13c. in Anglo-Latin; c.1400 in English), which has become the main sense as the use of ambergris has waned. This formerly was known as white or yellow amber to distinguish it from ambergris, which word entered English early 15c. from French, which distinguished the two substances as ambre gris and amber jaune. The classical word for Baltic amber was electrum (cf. electric).
(Ezek. 1:4, 27; 8:2. Heb., hashmal, rendered by the LXX. elektron, and by the Vulgate electrum), a metal compounded of silver and gold. Some translate the word by "polished brass," others "fine brass," as in Rev. 1:15; 2:18. It was probably the mixture now called electrum. The word has no connection, however, with what is now called amber, which is a gummy substance, reckoned as belonging to the mineral kingdom though of vegetable origin, a fossil resin.