littermates Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. animals born at the same time from the same mother. Example Sentence The puppies, being littermates, shared a strong bond with each other. Synonyms siblings; brothers and sisters; kin Antonyms strangers; unrelated animals Hear It! Say It! Write It! littermates Switch to cursive Start Share with your friends: