RhymeZone

 

Definitions of A:
  • noun:   the 1st letter of the Roman alphabet
  • noun:   the blood group whose red cells carry the A antigen
  • noun:   (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
  • noun:   one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
  • noun:   the basic unit of electric current adopted under the Systeme International d'Unites
    Example: "A typical household circuit carries 15 to 50 amps"
  • 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
  • noun:   any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

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