a

1. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

synset: angstrom, angstrom_unit, A

2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

synset: vitamin_A, antiophthalmic_factor, axerophthol, A

3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

synset: deoxyadenosine_monophosphate, A

4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

synset: adenine, A

5. the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"

synset: ampere, amp, A

6. the 1st letter of the Roman alphabet

synset: A, a

7. the blood group whose red cells carry the A antigen

synset: A, type_A, group_A

Princeton University "About WordNet." WordNet. Princeton University. 2010.

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