The word achenial refers to a type of fruit that develops without a seed. There are various synonyms that can be used to describe this type of fruit, including achene, cypsela, nutlet, and utricle. Each of these terms refers to a small, dry, one-seeded fruit that is produced by many different types of plants. These fruits are often dispersed by wind or animals, and some have evolved specialized structures to aid in their dispersal. While the term achenial may not be commonly used outside of botanical circles, its synonyms are frequently used to describe various types of small, dry fruits encountered in everyday life.