lateral face Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a flat surface on the side of a solid shape. Example Sentence The lateral face of the prism was painted blue. More Example Sentences Each lateral face shows a different color. Synonyms side surface; side; lateral side Antonyms top face; bottom face Hear It! Say It! Write It! lateral face Switch to cursive Start Share with your friends: