from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Atmospheric turbulence that occurs under tranquil and cloudless conditions and subjects aircraft to strong updrafts and downdrafts.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
erratic movementof air masses in the absenceof any visual cues, especially such movement that causes unexpectedturbulence to an aircraft.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun strong turbulence in an otherwise cloudless region that subjects aircraft to violent updrafts or downdrafts
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