brood pouch Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. 1 a pouch or cavity in certain animals such as frogs and fishes in which their eggs develop and hatch; 2 another name for marsupium Example Sentence The penguin held the baby in its brood pouch. Synonyms cavity for hatching eggs; animal pouch; marsupium Antonyms purse Hear It! Say It! Write It! brood pouch Switch to cursive Start Share with your friends: