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See more synonyms for massless on Thesaurus.com
adjective Physics.
  1. pertaining to an elementary particle having zero rest mass, as a photon.
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Origin of massless

First recorded in 1875–80; mass + -less
Related formsmass·less·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for massless

Historical Examples

  • In the inside of one there are fly-wheels, in the inside of the other a massless spring.

    Scientific American Supplement, No. 460, October 25, 1884