glow-worm Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a beetle that produces light at night. Example Sentence The glow-worm was emitting light from its abdomen. More Example Sentences Children love to see glow-worms outside. Synonyms firefly; lightning bug Antonyms plant Hear It! Say It! Write It! glow-worm Switch to cursive Start Share with your friends: