Aa

Adjective

  • Initialism of always afloat.
  • Abbreviation of ana ‎(“of each, equal parts”).
  • Initialism of arctic-alpine.

Noun

  • Initialism of approximate absolute.
  • Initialism of ascending aorta.
  • Initialism of average audience.
  • Abbreviation of adjectives.
  • Initialism of acting age.
  • Initialism of amino acid.
  • Initialism of armature accelerator.
  • Initialism of author's alteration.
  • Initialism of acetic acid.
  • Initialism of aminoacetone.
  • Initialism of arachidonic acid.
  • Initialism of atomic absorption.
  • Abbreviation of arteries.
  • (volcanology) 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. [First attested in the mid 19th century.]
  • (medicine) Initialism of alveolar-arterial.

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