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1. Sharp, closely space discontinuities in the trace of a cathode-ray
tube, produced by random interference; so named because of their
resemblance to blades of lawn grass.
2. In radar, a descriptive colloquialism used to refer to the indication
of noise on an 'A' or similar type of display. See noise. [[/a>|/a>
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use