Outrageously Funny Word Dictionary :: Underside

👉 Underneath in math, it refers to a part of a surface or object that is below another surface. In geometry, it can also refer to the region between two lines or planes. For example, an underside of a cube is any face that lies entirely below the edges. It's often used in physics and engineering when discussing surfaces that are not perfectly flat but are covered by other surfaces like walls.

undersides

👉 Underneath.

underside