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(obsolete) Ambergris, the waxy product of the sperm whale.
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A hard, generally yellow to brown translucent or transparent fossil resin from extinct coniferous trees of the pine genus, used for jewellery, decoration and later dissolved as a binder in varnishes. One variety, blue amber, appears blue rather than yellow under direct sunlight.
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A yellow-orange colour.
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(British, Australia) The intermediate light in a set of three traffic lights, which when illuminated indicates that drivers should stop when safe to do so. See also yellow light.
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(biology, genetics, biochemistry) The stop codon (nucleotide triplet) "UAG", or a mutant which has this stop codon at a premature place in its DNA sequence.
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(uncountable) Hesitance to proceed, or limited approval to proceed; an amber light.