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a

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a [n]
 
1)the blood group whose red cells carry the A antigen
    Synonyms :group_a type_a 
    See Also: blood_group 
 
2)a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
    Synonyms :angstrom angstrom_unit 
    See Also: metric_linear_unit  micromillimeter  micromicron 
 
3)any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
    Synonyms :antiophthalmic_factor axerophthol vitamin_a 
    See Also: fat-soluble_vitamin  retinol  dehydroretinol 
 
4)one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
    Synonyms :deoxyadenosine_monophosphate 
    See Also: nucleotide 
 
5)(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
    Synonyms :adenine 
    See Also: purine  deoxyribonucleic_acid  ribonucleic_acid  biochemistry 
 
6)the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"
    Synonyms :amp ampere 
    See Also: current_unit  abamp  ma 
 
7)the 1st letter of the Roman alphabet
    Synonyms :
    See Also: alphabetic_character  latin_alphabet 
 



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