Air mass

//ɛəɹ mæs// noun

Definitions

Noun
  1. 1
    A particular volume of air, especially one having a roughly uniform temperature, pressure and water vapour content.

    "After a 227-day drought ending with December temperatures above 90, a polar air mass collided with a wave of damp tropical air, condensed it in seven days of cloudburst."

  2. 2
    a large body of air with uniform characteristics horizontally wordnet

Etymology

Perhaps a calque of German Luftmasse.

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