mushrooms Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium Example Sentence Mom added mushrooms to the soup. Synonyms fungi; fungus; agaric Antonyms animal Hear It! Say It! Write It! mushrooms Switch to cursive Start Share with your friends: