Grade 1 seashells Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. hard outer coverings of sea animals like snails and clams. Example Sentence I collect seashells. More Example Sentences Seashells come in many shapes and colors. Synonyms shells; mollusk shells; marine shells Antonyms nutshell Hear It! Say It! Write It! seashells Switch to cursive Start Share with your friends: