1. (noun) 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
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
2. (noun) 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
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
3. (noun) deoxyadenosine monophosphate, A
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
4. (noun) adenine, A
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
5. (noun) ampere, amp, A
the basic unit of electric current adopted under the Systeme International d'Unites
Synonyms: type A, adenosine monophosphate, vitamin A, ampere, international ampere, adenylic acid, angstrom, angstrom unit, antiophthalmic factor, group A, adenine, deoxyadenosine monophosphate, amp, axerophthol
6. (noun) A, a
the 1st letter of the Roman alphabet
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
7. (noun) A, type A, group A
the blood group whose red cells carry the A antigen
Synonyms: antiophthalmic factor, adenine, axerophthol, vitamin A, group A, ampere, angstrom, angstrom unit, deoxyadenosine monophosphate, amp, type A
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Synonyms and Antonyms of a 
