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massless

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WordReference Random House Unabridged Dictionary of American English © 2026

mass•less adj. [Physics.]

Physicspertaining to an elementary particle having zero rest mass, as a photon.

mass + -less 1875–80

mass′less•ness, n.

'massless' also found in these entries (note: many are not synonyms or translations):

gluon - neutrino

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