Hypoplastic is a medical term used to describe an organ or tissue that is underdeveloped or has not grown to its full size. There are several synonyms available for the word hypoplastic. These include underdeveloped, embryonic, immature, rudimentary, and undeveloped. These words are commonly used by medical professionals to describe a wide range of organ and tissue abnormalities. While each synonym has its own specific application, all of them share a common meaning of indicating that a certain area of the body is not fully developed or functioning properly. Therefore, these terms are crucial for accurate diagnosis and treatment of various medical conditions.