/ ˈæmbə(r); NAmE / noun [ U ]
1.
a hard clear yellowish-brown substance, used in making decorative objects or jewellery :
amber beads
2.
a yellowish-brown colour :
The traffic lights were on amber.
► amber adjective
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WORD ORIGIN
late Middle English (also in the sense ambergris ): from Old French ambre , from Arabic 'anbar ambergris, later amber.