Visor

1. n. The fore piece of a cap, projecting over, and protecting the eyes.
2. n. A part of a helmet, arranged so as to lift or open, and so show the face. The openings for seeing and breathing are generally in it.
3. n. A mask used to disfigure or disguise.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.