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Meaning of A
1.
(n)
the 1st letter of the Roman alphabet
2.
(n)
the blood group whose red cells carry the A antigen
3.
(n)
the basic unit of electric current adopted under the Systeme International d''Unites; "a typical household circuit carries 15 to 50 amps"
4.
(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
5.
(n)
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
6.
(n)
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
7.
(n)
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
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