air mass

air mass

noun

Definition of AIR MASS

: a body of air extending hundreds or thousands of miles horizontally and sometimes as high as the stratosphere and maintaining as it travels nearly uniform conditions of temperature and humidity at any given level

First Known Use of AIR MASS

1882

Rhymes with AIR MASS

admass, alas, Alsace, amass, art glass, avgas, badass, bagasse, beach grass, bear grass, bent grass, black bass, Black Mass, bluegrass, bromegrass, bunchgrass, bypass, cheatgrass, cordgrass, crabgrass, crevasse, cuirass, cut glass, cut-grass, declass, degas, drop pass, Drygas, eelgrass, en masse, eyeglass, first-class, flint glass, float glass, folk mass, ground glass, groundmass, hand glass, harass, hard-ass, haul ass, high-class, high mass, hourglass, impasse, jackass, jump pass, kelp bass, kick ass, kick-ass, knotgrass, landmass, lead glass, low mass, Madras, milk glass, morass, nut grass, oat grass, outclass, outgas, palliasse, pier glass, plate glass, quartz glass, red mass, repass, rest mass, ribgrass, rock bass, ryegrass, salt grass, sandglass, saw grass, screen pass, sea bass, sheet glass, smart-ass, South Pass, spot pass, spun glass, spyglass, stained glass, star grass, striped bass, subclass, sunglass, sung mass, surpass, sweetgrass, switchgrass, sword grass, teargas, third-class, trespass, Troas, turfgrass, wheatgrass, white bass, wineglass, wire grass, wiseass, witchgrass, word class, world-class, yard grass

air mass

noun    (Concise Encyclopedia)

In meteorology, a large body of air having nearly uniform conditions of temperature and humidity at any given altitude. Such a mass has distinct boundaries and may extend hundreds or thousands of miles horizontally and sometimes as high as the top of the troposphere. An air mass forms whenever the atmosphere remains in contact with a large, relatively uniform land or sea surface long enough to acquire its temperature and moisture properties. The Earth's major air masses all originate in polar or subtropical latitudes. The middle latitudes constitute essentially a zone of modification, interaction, and mixing of the polar and tropical air masses.