a
/ə/
एक
noun
1. angstrom, angstrom unit, A
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron)
used to specify wavelengths of electromagnetic radiation
2. vitamin A, antiophthalmic factor, axerophthol, A
any of several fat-soluble vitamins essential for normal vision
prevents night blindness or inflammation or dryness of the eyes
3. deoxyadenosine monophosphate, A
one of the four nucleotides used in building DNA
all four nucleotides have a common phosphate group and a sugar (ribose)
4. adenine, A
(biochemistry) purine base found in DNA and RNA
pairs with thymine in DNA and with uracil in RNA
5. ampere, amp, A
the basic unit of electric current adopted under the Systeme International d'Unites
"a typical household circuit carries 15 to 50 amps"
6. A
the 1st letter of the Roman alphabet
7. A, type A, group A
the blood group whose red cells carry the A antigen
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