Ragged, worn-out; also, hackneyed, tired.
Of a page in a book or other publication: having its corner folded down, either due to having been read many times, or intentionally as a sort of bookmark.
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.