air mass

from WordNet (r) 3.0 (2006)

air mass
    n 1: a large body of air with uniform characteristics
         horizontally

from Moby Thesaurus II by Grady Ward, 1.0

22 Moby Thesaurus words for "air mass":
      anticyclone, cold front, cold sector, cyclone, front, high,
      high-pressure area, isobar, isometric, isometric line,
      isopiestic line, isotherm, isothermal line, low, low-pressure area,
      occluded front, polar front, squall line, stationary front,
      warm front, weather map, wind-shift line