fool's gold Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a common mineral iron disulfide that has a pale yellow color Example Sentence The novice gold digger was deceived by the fool's gold. Synonyms pyrite; iron pyrite; iron disulfide Antonyms gold Hear It! Say It! Write It! fool's gold Switch to cursive Start Share with your friends: