lb. Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a unit of weight equal to 16 ounces. Example Sentence Mom bought a lb. (abbreviated) of cherries. More Example Sentences I lifted a heavy box weighing two lb. Synonyms pound; weight unit; mass Antonyms inch Hear It! Say It! Write It! lb. Switch to cursive Start Share with your friends: