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.
Having little flesh; lean; thin.
Deficient or inferior in amount, quality or extent
Dry and harsh to the touch (e.g., as chalk).
Of a set: such that, considered as a subset of a (usually larger) topological space, it is in a precise sense small or negligible.
To make lean.
Argyrosomus regius, an edible fish of the family Sciaenidae.