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Dictionary

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

 

Hyponyms: vitamin A1, retinol, vitamin A2, dehydroretinol

 

Substance Meronyms: deoxyribonucleic acid, desoxyribonucleic acid, DNA, ribonucleic acid, RNA

 

Part Meronyms: abampere, abamp, nanometer, nanometre, nm, millimicron, micromillimeter, micromillimetre

 

Member Meronyms: Roman alphabet, Latin alphabet

 

 
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