GNU Collaborative International Dictionary of English

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Found one definition

1.       
   degauss (dḗ‑gousˈ), n.
   1. To make a (steel) ship's hull nonmagnetic by applying an opposing magnetic field.
   
   [WordNet 1.5]
   
   
   2. To remove irregular magnetization in (the electron gun of a cathode-ray tube); -- used to improve picture quality, especially in computer monitors.
   
   [PJC]