The crossword solution for the term SPHERE, SAY is SOLID. A sphere is a three-dimensional object that is perfectly round and has all points on its surface equidistant from its center. It is a type of geometrical shape that is found in nature, such as planets, stars, and bubbles. The word SOLID is used to describe an object that has a fixed shape and volume, meaning it does not change or deform when pressure is applied. This is the perfect word to describe a sphere, as it is a SOLID object with a fixed shape and volume.