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Definition aa

Etymology 1

From Hawaiian ʻaʻā.

Noun

aa (uncountable)

  1. (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. [From 19 c.]

Etymology 2

Abbreviation.

Noun

aa

  1. Initialism of acetic acid.
  2. Initialism of acting age.
  3. (medicine) Initialism of alveolar-arterial.
  4. Initialism of aminoacetone.
  5. Initialism of amino acid.
  6. Initialism of approximate absolute.
  7. Initialism of arachidonic acid.
  8. Initialism of armature accelerator.
  9. Initialism of ascending aorta.
  10. Initialism of atomic absorption.
  11. Initialism of author's alteration.
  12. Initialism of average audience.
Adjective

aa (not comparable)

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

Etymology 3

Compare pp.

Noun

aa pl (plural only)

  1. Abbreviation of adjectives.
  2. Abbreviation of arteries.

Etymology 4

Contraction.

Adjective

aa

  1. Abbreviation of ana (“of each, equal parts”).

Try searching for words with the letters AA, words with the phrase AA, words starting with the letters AA, or words ending in the letters AA.