The term GRAPE SEED can be broken down into two crossword solutions: PIP (3 letters) and ACINUS (6 letters). PIP is an informal term for the seed of a grape, which is found inside the fruit. Acinus is the scientific name for the seed of a grape, which is a small, hard, dry seed. Grapes are a type of berry that have been cultivated for thousands of years and are used in many different types of food and drinks.