Gibbousness refers to the state or quality of being rounded or swollen. There are several synonyms for this word, such as bulging, swelling, protuberance, and enlargement. These words describe the convex shape of an object or surface. Other synonyms for gibbousness include bloated, distended, swollen, and tumefaction. All of these words refer to a state of increased size or volume, often caused by the accumulation of fluid or tissue. Gibbousness is a characteristic commonly found in medical conditions such as edema or swelling caused by injury or disease. It is also a defining feature of astronomy and is used to describe the phase of the moon when it is more than half illuminated.