surface of a field; plain
Refers to the open, natural ground of a field or plain, often emphasizing the unworked or natural surface.
Grass grows thickly on the surface of the field.
unworked stone surface; rough plank surface
Used in stonemasonry and carpentry for the natural, unpolished surface of quarried stone or the rough face of a plank.
The unworked surface of this stone has not been processed yet.
Compound of 野 (の, 'field') and 面 (づら, 'surface, face'). The reading づら is a voiced form of つら.