Surface texture is a term used to describe the physical characteristics of a surface, such as its roughness, smoothness, and other tactile qualities. It is an important factor in many industries, including manufacturing, construction, and design. Surface texture can be measured using various methods, such as optical microscopy, scanning electron microscopy, and atomic force microscopy. The FINISH solution for this crossword is SMOOTH, which means having a flat, even surface without any irregularities or bumps.