massless

[ mas-lis ]
/ ˈmæs lɪs /

adjective Physics.

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

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ELEMENTARY SCHOOL PUNCTUATION QUIZ

Punctuation marks help make writing easy to read and understand. Some of the most important ones are the period (.), comma (,), question mark (?), and exclamation point (!). How well do you know how to use them? Find out in this quiz!
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Which punctuation mark is best for this sentence? "Can I watch a movie __"

Origin of massless

First recorded in 1875–80; mass + -less

OTHER WORDS FROM massless

mass·less·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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