seadragon Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a marine fish in the family Syngnathidae Example Sentence The leafy seadragon is found along the coast of Australia. Synonyms marine fish; Phycodurus eques; fish Antonyms land animal Hear It! Say It! Write It! seadragon Switch to cursive Start Share with your friends: