Eyebrow (noun)

1. Either of the two hairy arches above the eyes that protect them from sweat and the sun.
2. The line of hair above the eye.

Origin:

Old english ēagboga, from ēage "eye" + boga "arch".

Examples:

1. She raised her eyebrow in surprise.
2. He had bushy eyebrows.
3. She plucked her eyebrows to shape them.
4. The eyebrows were an important part of her makeup routine.
5. The eyebrows were a distinctive feature of his face.