Aqueous humour, also known as aqueous fluid, is a clear, watery fluid that fills the front part of the eye. It provides a constant pressure that shapes the cornea and helps to maintain the eye's shape. There are a few synonyms for aqueous humour that are commonly used in the medical field, such as aqueous fluid, aqueous humor, and vitreous humour. Other terms that can be used to describe this fluid include hydrating fluid, ocular fluid, and intraocular fluid. Regardless of the terminology used, aqueous humour plays an essential role in maintaining the health and functionality of the eye.