noun
hair
HAIR/her/
A fine threadlike strand growing from skin.
Each fine hair emerges from the scalp along the man's natural part.

Etymology
Old English hær meant both hair collectively and an individual strand, so the modern sense preserves both the ancestor’s meaning and its collective and individual uses.
In context
you can see the regrowth and measure against how many weeks since the color was done. Now, hair growing out of the head
More examples
- She brushes her hair before work.
- Dog hairs cling to the couch cushions.
- He plucks a stray hair from his eyebrow.
Forms
hair · hairs
hairy adjective — Covered with a lot of hair.
hairless adjective — Having no hair on the surface.
Similar words
- bristle
- A short, stiff hair rather than a soft, flexible one.
- whisker
- A facial hair, especially a stiff one on an animal.