medusae Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. jellyfish that have a bell-shaped body. Example Sentence The marine biologist spent his entire career studying various species of medusae. More Example Sentences The medusae glowed in the dark water. Synonyms jellyfish; sea jelly; medusa Antonyms polyp; coral Hear It! Say It! Write It! medusae Switch to cursive Start Share with your friends: