I. noun — [ mass noun] 1. hard translucent fossilized resin originating from extinct coniferous trees of the Tertiary period, typically yellowish in colour. It has been used in jewellery since antiquity. 2. a honey-yellow colour typical of amber[as modifier] • amber eyes.
3. a yellow light used as a cautionary signal between green for ‘go’ and red for ‘stop’ • the lights were at amber.
– origin late Middle English (also in the sense ‘ambergris’): from Old French ambre, from Arabic ‘anbar ‘ambergris’, later ‘amber’.