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.
Not focused straight at the target or subject, but by more subtle means
Not of obvious or immediate cause, but as a secondary result
Not involving the quickest, shortest, or most convenient path
To access by means of indirection; to dereference.
An indirect cost.
An indirect radiator