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A plate, grating, or the like used especially to block, hinder, or divert a flow or to hinder the passage of something, as: (a) A plate used to conduct, or help to conduct, a flow of cooling air around an engine cylinder. (b) A plate, wall, or the like in a fuel tank or other liquid container, used especially to prevent sloshing of the contents. (c) A ridge or wall on the top of a piston in a two-stroke-cycle engine, used to deflect the incoming mixture upward and divert it from the exhaust port. (d) A plate in the forward section of a pitot tube, used to reduce turbulence in the tube and to prevent dirt, moisture, etc., from entering the system.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use