What do a.m. and p.m. stand for?

permanent magnet

a magnet that retains its magnetism after being removed from an external magnetic field.
Origin of permanent magnet
Related forms
permanent magnetism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for permanent magnet
  • Then when a permanent magnet is moved over the area, the clips or filings will bunch together and hump up to a peak.
  • The power plant is a permanent magnet synchronous electric motor.
  • Unlike a permanent magnet, an electromagnet creates a magnetic field when an electric current is applied to it.
  • permanent magnet alternators are simpler, cheaper, and much more productive than in the past thanks to better magnet technology.
  • When the external field is removed, the domains remain aligned, producing a permanent magnet.
  • The photos show wild type algae and magnetic algae placed in a test tube next to a permanent magnet.
  • The rotors include a permanent magnet rotor and a magnetic coupling rotor, configured to act with a permanent magnet.
  • The charging system includes a magnetic loop including a permanent magnet for establishing a magnetic field through the loop.
British Dictionary definitions for permanent magnet

permanent magnet

a magnet, often of steel, that retains its magnetization after the magnetic field producing it has been removed
Derived Forms
permanent magnetism, noun
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
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permanent magnet in Science
permanent magnet
A piece of ferromagnetic material that retains its magnetism after it has been magnetized.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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