A cnidarian in its free-swimming stage. Medusas are bell-shaped, with tentacles hanging down around a central mouth. Jellyfish are medusas, while corals and sea anemones lack a medusa stage and exist only as polyps.
Compare polyp
1750–60; special use of Medusa, alluding to the Gorgon's snaky locks
< Latin < Greek Médousa, special use of médousa, feminine of médōn ruling
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A jellyfish begins its life cycle as an anemone-like creature on the sea floor before undergoing a metamorphosis and sprouting into a recognizable medusa — that Pacman ghost shape we're all familiar with.
From Salon ● Aug. 2, 2023
Scientists prefer the term jelly or medusa over jellyfish because the creatures are not fish.
From Los Angeles Times ● Apr. 25, 2022
A black floor-length gown with undulating straps could have been a poisonous medusa, with coral-red dye bleeding down its multi-layered skirt.
From Washington Times ● Jan. 20, 2020
She conjures a lineage of threatening archetypes: the harpy and her talons, the witch and her spells, the medusa and her writhing locks.
From New York Times ● Jan. 17, 2018
Then they have taken the form of a medusa.
From "The Thing About Jellyfish" by Ali Benjamin
Only much later would I realize that it wasn’t so much a smorgasbord of vendors as it was the Gorgon Medusa: When one head is removed, more sprout in its place.
From Slate ● Jan. 13, 2026
When the monster emerges in the water tower, a moss-covered, faucet-dripping, steam-seeping laboratory punctuated by a screaming sculpture of Medusa, he’s as old as he is new.
From The Wall Street Journal ● Sep. 30, 2025
Tiesto, Medusa and Danny Howard have played Tigerblind's latest track, Battery Operated, in their live sets.
From BBC ● Mar. 31, 2025
Debi Mazar pops in as a good Medusa, with a scarf tied around her snake hair.
From Los Angeles Times ● Aug. 29, 2024
The golden head of Medusa molded in the center was so horrible, the campers all backed away.
From "The Last Olympian" by Rick Riordan
Wearing a toadstool headdress and a skirt embellished with Medusas, El Beh has one of the most striking looks — though the orange ram’s horns on Trebien Pollard are quite something, too.
From New York Times ● Jan. 23, 2022
Medusas are the successors of Bruitparif’s first-generation sensors, called Sonopodes, which rely on expensive components imported from Japan.
From The New Yorker ● May 6, 2019
The band's final two songs are I Am The King and Medusas "which sounds like it's a Greek myth but is actually about jelly fish".
From BBC ● Feb. 28, 2019
He wielded his clinical obligation like Perseus’s shield, in which a cavalcade of Medusas lost their stony power.
From The Guardian ● Sep. 4, 2015
I followed the hissing and spitting sounds of Medusas hair.
From "The Lightning Thief" by Rick Riordan
“I was able to actually collect some of those medusae last year during the bloom, but rearing gelatinous organisms is pretty difficult,” Stajner said.
From Los Angeles Times ● May 3, 2024
Although beached by-the-wind sailors die in great numbers, they most probably have already reproduced and left thousands of medusae in the sea, according to Wagner.
From Los Angeles Times ● Mar. 29, 2024
Before they adhere to the ocean’s surface, they live underwater as tiny creatures known as medusae, Wagner said.
From Los Angeles Times ● Mar. 29, 2024
The larger portion of these medusae, consisting of transparent substances of a lemon-yellow colour, and globular form, appeared to possess very little power of motion.
From The Ocean and its Wonders by Ballantyne, R. M. (Robert Michael)
Shrimps, small fish, lobsters, various mollusks, and medusae form his diet.
From The Swiss Family Robinson or, Adventures on a Desert Island by Wyss, Jean Rudolph
The blue seafaring colonies are themselves asexual, though they bud off tiny transparent medusas that are thought to go to the deep sea and reproduce sexually there, Stajner said.
From Los Angeles Times ● May 3, 2024
Vivid hues that evoked the sea beds and headwear that resembled medusas continued the theme.
From Seattle Times ● Mar. 1, 2022
But not all marine lakes have medusas, the bell-shape organisms you probably think of when the word "jellyfish" comes to mind.
From National Geographic ● Feb. 28, 2018
The ephyra grow into medusas, the mature forms of the jellyfish.
From Textbooks ● Jan. 1, 2015
Directly afterwards we found ourselves in a shoal of medusas or jellyfish.
From My First Voyage to Southern Seas by Pearse, Alfred
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
