accretion
An accumulation of extraneous material, such as dirt or salts, on the surface of a monument or building. 2. The addition of elements to a building after the initial construction due to expansion or other alterations. (Bucher, 1996)
An accumulation of extraneous material, such as dirt or salts, on the surface of a monument or building. 2. The addition of elements to a building after the initial construction due to expansion or other alterations. (Bucher, 1996)