Grass wrack is a term used to describe a type of seaweed that is commonly found on rocky shorelines. This green seaweed has numerous synonyms, such as eel grass, green wrack, and sea lettuce. With its long, thin blades, it provides shelter and food for a wide range of marine creatures, including snails, crabs, and fish. Other synonyms for grass wrack include bladder wrack, knotted wrack, and spiral wrack. This seaweed is known for its medicinal properties, as it has been used for centuries to treat everything from digestive issues to skin conditions. Regardless of what you call it, grass wrack is an important part of the marine ecosystem.