AA

A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.

Initialism of acting age.

Initialism of alveolar-arterial.

Initialism of approximate absolute.

Initialism of armature accelerator.

Initialism of ascending aorta.

Initialism of atomic absorption.

Initialism of author's alteration.

Initialism of average audience.

Initialism of arctic-alpine.

Initialism of always afloat.

A clear colourless organic acid, CH3COOH, formed by the oxidation of ethanol; it is used as a solvent and has very many industrial applications; it is the major acidic component of vinegar.

Any organic compound containing both an amino and a carboxylic acid functional group.

Any of the twenty naturally occurring α-amino acids (having the amino, and carboxylic acid groups on the same carbon atom), and a variety of side chains, that combine, via peptide bonds, to form proteins.

1-amino-2-propanone, a secondary amino ketone

A long-chain polyunsaturated fatty acid, having 20 carbon atoms and four double bonds, found in animal fats; it is essential for human nutrition, being a precursor to the production of prostaglandins.

Abbreviation of ana.