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 A A

noun

  • ( ) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation  ( A, angstrom, angstrom unit )
    a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
  • the blood group whose red cells carry the A antigen  ( A, group A, type A )
    the blood group whose red cells carry the A antigen
  • the 1st letter of the Roman alphabet  ( A )
    the 1st letter of the Roman alphabet
  • the basic unit of electric current adopted under the Systeme International d'Unites  ( A, amp, ampere )
    the basic unit of electric current adopted under the Systeme International d'Unites
     a typical household circuit carries 15 to 50 amps
    a typical household circuit carries 15 to 50 amps
  • (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA  ( A, adenine )
    (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
  • one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)  ( A, deoxyadenosine monophosphate )
    one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
  • any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes  ( A, antiophthalmic factor, axerophthol, vitamin A )
    any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes


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