A2

See also: a2 and A-2

English

Alternative forms
  • (cardiology): A2

Etymology

See the Wikipedia article ISO 216, the international standard on paper sizes.

Adjective

A2 (not comparable)

  1. A standard paper size, defined by ISO 216.
    dimensions: 594 x 420 mm (594.60 x 420.45 mm)
  2. (virology) A type of Asian influenza virus.
    • 1877, John Holmes Dingle, 'Biographical Memoirs', volume 61:
      ...antibody response to Influenza (A2) virus.
  3. (cardiology) Aortic second sound.
    • 2012, Perloff, Joseph K.; Marelli, Ariane, Perloff's Clinical Recognition of Congenital Heart Disease:
      and the aortic component of the second sound (A2) is normal.

See also
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