I. “+ noun
Etymology: sub- + surface
1. : soil situated just above the subsoil ; broadly : rocks or other earth materials near but not exposed at the surface of the ground
2. : the portion of a body of water that lies immediately below the surface
II. adjective
1. : being, occurring, or used under a surface
subsurface printing
a subsurface flow of water
2. : of, relating to, or being something located or concealed beneath a surface (as of the ground)
subsurface riches