backbones Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. the series of small bones that form the spine. Example Sentence Mammals have backbones therefore they are vertebrates. More Example Sentences The doctor checked his backbones for problems. Synonyms spine; vertebrae; backbone Hear It! Say It! Write It! backbones Switch to cursive Start Share with your friends:
