very thin, as thin as a hair
A fishing line made from hair.
The line along one's forehead where hair starts growing.
A very thin line in writing, drawing, or typography.
A very thin fissure.
Lacking depth of character or understanding; lacking substance or significance.
Not thorough, deep, or complete; concerned only with the obvious or apparent.
Existing, occurring, or located on the surface.
Appearing to be true or real only until examined more closely.
Situated or occurring on the skin or immediately beneath it.
Two-dimensional; drawn on a flat surface.
Denoting a quantity of a material expressed in terms of area covered rather than linear dimension or volume.
A surface detail.