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massless

[mas-lis] /ˈmæs lɪs/
adjective, Physics.
1.
pertaining to an elementary particle having zero rest mass, as a photon.
Origin
1875-1880
1875-80; mass + -less
Related forms
masslessness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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