noun

• (obsolete) Ambergris, the waxy product of the sperm whale.
  "Ambre is hote and drye […] Some say that it is the sparme of a whale."
• (obsolete) Ambergris, the waxy product of the sperm whale.
  "The leaves of the foreſt were loaded with manna, pure amber dropped from every bough, honey diſtilled from the rifted rock, and the humming bee, drunk with joy, ſtrayed from flower to flower, forgetful of his burſting cells."
• (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.
  "While earlier controllers provided concurrent ambers, present practice is to indicate a minimum intergreen period of 4 s."
• (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.
  "an amber codon, an amber mutation, an amber suppressor"

verb

• (transitive, rare) To perfume or flavour with ambergris.
  "ambered wine, an ambered room"
• (transitive, rare) To preserve in amber.
  "an ambered fly"
• (transitive, rare, chiefly poetic or literary) To cause to take on the yellow colour of amber.
  "For purple mountains majesty; for amber waves of grain."
• (intransitive, rare, chiefly poetic or literary) To take on the yellow colour of amber.
  "Westward along Lancaster Avenue, among the stone walls and broad driveways of imposing old houses—their lawns dappled with the shade of ambering maples and dusty, bark-peeled sycamores—"