A

مترادف و متضاد a

1. article The indefinite article; before vowels, written ""an''
   Synonyms: some, each, one, any, some kind of, some particular, any of, any one of, a certain
   Antonyms: the, this, that
2. article An indication of frequency
   Synonyms: per, in-a, on a, each, every, to-the, by-the, at the rate of
3. noun Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
   Synonyms: vitamin-a, antiophthalmic factor, axerophthol
4. noun One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
   Synonyms: deoxyadenosine monophosphate
5. noun (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
   Synonyms: adenine
6. noun 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
7. noun The basic unit of electric current adopted under the Systeme International d'Unites
   Synonyms: ampere, amp
8. noun The blood group whose red cells carry the A antigen
   Synonyms: type a, group A
9. noun The 1st letter of the Roman alphabet
   Synonyms: a