Usually means: Having no mass; zero weight.
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We found 14 dictionaries that define the word massless:

General (11 matching dictionaries)
  1. massless: Merriam-Webster
  2. massless: Oxford Learner's Dictionaries
  3. massless: American Heritage Dictionary of the English Language
  4. massless: Collins English Dictionary
  5. massless: Wordnik
  6. massless: Wiktionary
  7. massless: Webster's New World College Dictionary, 4th Ed.
  8. massless: The Wordsmyth English Dictionary-Thesaurus
  9. massless: Infoplease Dictionary
  10. massless: Dictionary.com
  11. massless: TheFreeDictionary.com

Business (1 matching dictionary)
  1. massless: Legal dictionary

Computing (1 matching dictionary)
  1. massless: Encyclopedia

Medicine (1 matching dictionary)
  1. massless: Medical dictionary

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Definitions from Wiktionary (massless)

▸ adjective:  Having no mass.

Similar:
gravityless, weightless, matterless, sizeless, volumeless, gravitationless, chargeless, energyless, dimensionless, forceless, more...

Opposite:
massive, weighty, heavy

Types:
photon, neutrino, graviton, more...

Phrases:
Massless particle, more...

▸ Words similar to massless

▸ Usage examples for massless

▸ Idioms related to massless

▸ Wikipedia articles (New!)

▸ Popular nouns described by massless

▸ Words that often appear near massless

▸ Rhymes of massless

▸ Invented words related to massless

Similar:
gravityless, weightless, matterless, sizeless, volumeless, gravitationless, chargeless, energyless, dimensionless, forceless, more...

Opposite:
massive, weighty, heavy

Types:
photon, neutrino, graviton, more...

Phrases:
Massless particle, more...



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