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.
very thin, as thin as a hair
A sunfish.
sunny side up
Of or relating to the sun; proceeding from, or resembling the sun; shiny; radiant.
Receiving a lot of sunshine.
Cheerful.
Featuring a lot of sunshine.