Meaning and Definition of A
>> Noun
What does A mean? (Noun)
1·· the blood group whose red cells carry the A antigen.
2·· the 1st letter of the Roman alphabet.
3·· the basic unit of electric current adopted under the Systeme International d'Unites.
"A typical household circuit carries 15 to 50 amps."
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.
5·· (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.
6·· one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose).
7·· any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.
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