Geol. of or having to do with the surface of the earth, surface deposits, etc.
Origin of surficial(surf)ace + -icial, as in superficial
Of, relating to, or occurring on or near the surface of the earth.
Origin of surficialsurf(ace) (superf)icial
- Of or pertaining to the surface of something.
- When the soil swells on wetting, the former surficial material is mixed with the subsoil.