English dictionary definition of:



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


adenine amp ampere angstrom axerophthol

Scrabble score for A

Scrabble score = 1

generated at 16:08:10 on 18-11-19

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