Illustration of jellyfish
- jellyfish 1a
jellyfish
noun
jel·ly·fish
ˈje-lē-ˌfish 
1
a
: the typically free-swimming, bell-shaped, usually sexually-reproducing solitary or colonial form of a cnidarian in which the whorls of tentacles lined with nematocysts arise and hang down from the margin of the nearly transparent, gelatinous bell : medusa
especially
: a large medusa characteristic of the siphonophores and scyphozoans (such as the sea nettle or box jellyfish)
b
c
2
: a person lacking backbone or firmness
Examples of jellyfish in a Sentence
a jellyfish who was afraid to tell her boss that her latest brainstorm was just plain bad
Recent Examples on the Web
Then came a clip of me, snorkeling alongside tens of thousands of (non-stinging) golden jellyfish in a lake on Mecherchar Island.
—
Jennifer Billock, Travel + Leisure, 19 Jan. 2025
Zuckerberg blasts Biden admin on Joe Rogan; Dave Portnoy calls CEO ‘spineless jellyfish’
Robby Soave and Lynda Tran react to Mark Zuckerberg’s appearance on The Joe Rogan Experience podcast.
—The Hill, 13 Jan. 2025
The Panama Canal has a long history of sea creatures voyaging through as stowaways on ships’ hulls and in their ballast tanks: oysters from the Indo-Pacific, jellyfish from the Black Sea, worms from mud flats in the Netherlands.
—Charlie Cordero, New York Times, 7 Jan. 2025
The reefs are close to shore and offer lots of small hiding spaces for tropical sea life (just watch out for the jellyfish).
—Sandy Allen, AFAR Media, 10 Jan. 2025
See all Example Sentences for jellyfish 
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Jennifer Billock, Travel + Leisure, 19 Jan. 2025
Zuckerberg blasts Biden admin on Joe Rogan; Dave Portnoy calls CEO ‘spineless jellyfish’
Robby Soave and Lynda Tran react to Mark Zuckerberg’s appearance on The Joe Rogan Experience podcast.
—The Hill, 13 Jan. 2025
The Panama Canal has a long history of sea creatures voyaging through as stowaways on ships’ hulls and in their ballast tanks: oysters from the Indo-Pacific, jellyfish from the Black Sea, worms from mud flats in the Netherlands.
—Charlie Cordero, New York Times, 7 Jan. 2025
The reefs are close to shore and offer lots of small hiding spaces for tropical sea life (just watch out for the jellyfish).
—Sandy Allen, AFAR Media, 10 Jan. 2025
See all Example Sentences for jellyfish
Dictionary Entries Near jellyfish
Cite this Entry
“Jellyfish.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/jellyfish. Accessed 2 Feb. 2025.
Copy CitationKids Definition
jellyfish
noun
jel·ly·fish
ˈjel-ē-ˌfish
1
: any of numerous free-swimming coelenterate animals that reproduce sexually and have a jellylike, saucer-shaped, and usually nearly transparent body and tentacles with stinging cells
2
: any of various sea animals that resemble a jellyfish
Medical Definition
jellyfish
noun
jel·ly·fish
ˈjel-ē-ˌfish
: a free-swimming marine coelenterate that is the sexually reproducing form of a hydrozoan or scyphozoan and has a nearly transparent saucer-shaped body and extensible marginal tentacles studded with stinging cells
Love words? Need even more definitions?
Merriam-Webster unabridged
Share