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massless

 - 2 dictionary results

mass⋅less

  [mas-lis]
Use massless in a Sentence
–adjective Physics.
pertaining to an elementary particle having zero rest mass, as a photon.
Origin:
1875–80; mass + -less

Related forms:
mass⋅less⋅ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To massless
mass·less   (mās'lĭs)   
adj.  Having a mass of zero.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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