Meaning of “amber” in the English Dictionary

"amber" in British English

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ambernoun [ U ]

uk /ˈæm.bər/ us /ˈæm.bɚ/

a hard, transparent, yellowish-brown substance that was formed in ancient times from resin (= a substance produced by trees) and is used in jewellery:

He has a collection of prehistoric insects preserved in amber.

mainly UK US usually yellow the yellowish-orange traffic light that shows between the green and the red to warn drivers that the lights are about to change:

The lights turned to amber.
adjective uk us

an amber light
an amber necklace (= made of amber)

(Definition of “amber” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)