Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
an instrument for measuring small forces, such as those caused by gravitation, electric charges, or magnetism, by recording the amount of torsion they produce in a fine wire
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An instrument with which small forces, as of electricity or magnetism, are measured by means of the torsion they produce in a wire or slender rod.