Posterial is an adjective that describes something situated or occurring at the back of the body, usually in reference to the buttocks or the rear end. Some synonyms for posterial include dorsal, caudal, hindmost, tail end, rearward and posterior. These words all refer to a similar location at the back of the body but may have slightly different connotations depending on context. For example, dorsal may be used to describe the uppermost back area of an animal, while caudal refers specifically to the tail end of an organism. Regardless of the synonym used, posterial remains a useful term when discussing anatomical position or relative location.