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swash plate

or swash·plate

noun Machinery.
  1. an inclined circular plate on a rotating shaft for transferring force and motion to or from parts reciprocating in a direction parallel to the axis of shaft rotation.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for swash plate

swash plate

noun
  1. engineering a collar or face plate on a shaft that is inclined at an oblique angle to the axis of rotation and either imparts reciprocating motion to push rods parallel to the shaft axis as in a swash plate pump or, conversely, converts reciprocating motion to rotation as in a swash plate motorAlso called: wobble plate
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Word Origin for swash plate

from swash (obsolete n) an oblique figure or ornament, from aswash: see swash letter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012