A

1. Abbreviation for ampere; adenine; alanine. 2. As a subscript, refers to alveolar gas. 3. Symbol (usually capitalized italic) for absorbance. 4. Symbol for adenosine or adenylic acid in polynucleotides; alanine or alanyl in polypeptides; first substrate in a multisubstrate enzyme-catalyzed reaction.

Symbol for absorbance; Helmholtz energy.

* * *

abnormal; abortion; absolute temperature; absorbance; acceptor; accommodation; acetone; acetum; achondroplasia; acid; acidophil, acidophilic; acromion; actin; Actinomyces; activity [radiation]; adenine; adenoma; adenosine; admittance; adrenalin; Adriamycin; adult; age; akinetic; alanine; albino [guinea pig]; albumin; allergologist, allergy; alpha [cell]; alveolar gas; ambulation; ampere; amphetamine; ampicillin; amplitude; anaphylaxis; androsterone; anesthetic; angstrom, Angstrom unit; anode; Anopheles; antagonism; anterior; antibody; antrectomy; apical; aqueous; area; argon; artery [Lat. arteria]; atomic weight; atrium; atropine; auricle; auscultation; axial; axilla, axillary; before [Lat. ante]; blood group A; ear [Lat. auris]; mass number; subspinale; total acidity; tumor limited to the bowel [Dukes classification]; tumor limited to the mucosa [Astler- Coller classification]; water [Lat. aqua]; year [Lat. annum] cumulated activity; antinuclear antibody

* * *

A abbr

1) adenine

2) ampere

A 'ā n the one of the four ABO blood groups characterized by the presence of antigens designated by the letter A and by the presence of antibodies against the antigens present in the B blood group

Å symbol angstrom

* * *

accommodation; adenine or adenosine; alanine; ampere; anode; anterior; (as a subscript) alveolar gas.