It looks like there was a bit of confusion with the term "sth." In English, "sth" is not an actual word; rather, it is an abbreviation that stands for "something." This abbreviation is often used in informal writing or texting when people want to save time. However, let's focus on the definition you provided, which seems to relate to a specific hormone.
Word: Growth Hormone
In summary, "growth hormone" is an important term in biology and health that refers to a hormone necessary for human growth and development. You can use it in discussions related to health, fitness, and childhood development.