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Definitions for A

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  • The blood group whose red cells carry the A antigen

  • The 1st letter of the Roman alphabet

  • The basic unit of electric current adopted under the Systeme International d'Unites

  • A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

  • Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

  • One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

  • (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

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