A

Definition:

1. [noun] the blood group whose red cells carry the A antigen
   Synonyms: type A, group A

2. [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: ngstrom, ngstrom unit

3. [noun] any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
   Synonyms: vitmin A, ntiophthlmic fctor, xerophthol

4. [noun] one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
   Synonyms: deoxydenosine monophosphte

5. [noun] (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
   Synonyms: denine

6. [noun] the basic unit of electric current adopted under the Systeme International d’Unites; “a typical household circuit carries 15 to 50 amps”
   Synonyms: mpere, mp

7. [noun] the 1st letter of the Roman alphabet

Synonyms:

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Related Words:

• vitamin A1, retinol
• vitamin A2, dehydroretinol