bas-relief UK /ˈbæs.ɹɪˌliːf/US /ˌbɑ.ɹɪˈlif/adjective 1noun 1forms 2 adjective1 •In the bas-relief style; low or mostly flat. noun1 •A low or mostly-flat sculpture which is carved into a wall, or is in the form of a tile mounted flat to a wall, rather than a fully three-dimensional, free-standing figure. formsbas reliefs · bas-reliefs