[ mas-lis ]
/ ˈmæs lɪs /
pertaining to an elementary particle having zero rest mass, as a photon.
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Question 1 of 10
OTHER WORDS FROM masslessmass·less·ness, noun
Words nearby massless
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for massless
In the inside of one there are fly-wheels, in the inside of the other a massless spring.