Nearby Words

massless

[mas-lis]

mass·less

[mas-lis]
adjective Physics.
pertaining to an elementary particle having zero rest mass, as a photon.

Origin:
1875–80; mass + -less

mass·less·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Massless is always a great word to know.
So is wave. Does it mean:
a progressive disturbance propagated in a medium without progress or advance by the points themselves, as in the transmission of sound or light
a very large colliding-beam machine in which superconducting magnets create millions of megavolts of energy
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