aa

Noun

aa noun

1. 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.

aa noun

1. Initialism of acting age.
2. Initialism of alveolar-arterial.
3. Initialism of approximate absolute.
4. Initialism of armature accelerator.

aa noun

1. 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.

aa noun

1. Any organic compound containing both an amino and a carboxylic acid functional group.
2. 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.

aa noun

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

aa noun

1. 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.

Verb

No verb senses have been added yet.

Adjective

aa adjective

1. Initialism of arctic-alpine.
2. Initialism of always afloat.

Adjective

aa adjective

1. Abbreviation of ana.