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Definition aa

Etymology 1

From Hawaiian ʻaʻā.


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




  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.

aa (not comparable)

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

Etymology 3

Compare pp.


aa pl (plural only)

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

Etymology 4




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

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10 letter words with the letters AA 

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