1977, in the meaning defined above
graviton + -ino (as in neutrino)
Keep scrolling for more
Time Traveler for gravitino
See more words from the same year
Cite this Entry
“Gravitino.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gravitino. Accessed 24 Nov. 2020.
More from Merriam-Webster on gravitino
Britannica.com: Encyclopedia article about gravitino
Comments on gravitino
What made you want to look up gravitino? Please tell us where you read or heard it (including the quote, if possible).
See Definitions and Examples »
Get Word of the Day daily email!
Great Scrabble Words—A Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
And how the bird got its nickname
Words from the week of 11/20/2020
Just what the doctor ordered (or not).
The history of 'confess' and more
We're intent on clearing it up
We're gonna stop you right there
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
Words to improve your Scrabble game
Never be caught off guard
Build a city of skyscrapers—one synonym at a time.