Emily Dickinson Lexicon

VI'SOR, n. [s as z; Fr. visiere; It. visiera; from L. visus, video; written also visard, visar, vizard.]

1. A head piece or mask used to disfigure and disguise. My weaker government since, makes you pull off the visor. – Sidney. Swarms of knaves the visor quite disgrace. – Young.
2. A perforated part of a helmet. – Sidney.