[n] the 1st letter of the Roman alphabet
[n] the blood group whose red cells carry the A antigen
[n] the basic unit of electric current adopted under the System International d'Unites; "a typical household circuit carries 15 to 50 amps"
[n] a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
[n] one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
[n] any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes