a

• (noun)
  1. the blood group whose red cells carry the A antigen (context:body)
  2. the 1st letter of the Roman alphabet (context:communication)
  3. the basic unit of electric current adopted under the Systeme International d’Unites (context:quantity)
  4. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation (context:quantity)
  5. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA (context:substance)
  6. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) (context:substance)
  7. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes (context:substance)

• a typical household circuit carries 15 to 50 amps

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