Source: FM 3-6 Field Behavior of NBC Agents.
- (physics) Meteorology. A principal medium-level cloud type in the form of a gray or blue, bluish (never white) sheet or layer of striated, fibrous, or uniform appearance. Altostratus very often totally covers the sky, and may, in fact, cover an area of several thousand square miles. The layer has parts thin enough to reveal the position of the sun; and if gaps and rifts appear, they are irregularly shaped and spaced. (Abbreviated As.)
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