A usually scented hairstyling product in aerosol form that stiffens the hair, so it stays in a certain hairstyle.

(letterpress typography) A piece of metal type used to create the narrowest space. / (typography, US) The narrowest space appearing between letters and punctuation.

Having coarse, stiff hair.

Having hair that is very black and lustrous.

the width of a hair, a very short distance or a very small amount

A very short distance or a very small amount (as is the width of a hair).

A trigger that will set off a firearm when even a very small pressure is applied.

Unstable; in a situation that could be worsened by the slightest mistake. / Easily angered; having a short temper.

(idiomatic) An accidental messy hairdo resulting from the wearing of a hat.

(golf) The closely mown grass that surrounds a putting green, between the putting surface and any rough that might also surround the green. / (US, politics, slang) Money contributed to a campaign.