Origin and history of visor
visor(n.)
c. 1300, viser, "front part of a helmet," from Anglo-French viser, Old French visiere "visor" (13c.), from vis "face, appearance," from Latin visus "a look, vision," from past participle stem of videre "to see" (see vision (n.)).
The spelling shifted 15c. It is attested by 1864 as "stiff, round part in the front of a cap;" the meaning "eyeshade" is by 1925.
Entries linking to visor
c. 1300, visioun, "that which is seen," specifically "something seen in the imagination or in the supernatural" by one sleeping or waking; from Anglo-French visioun, Old French vision "presence, sight; view, look, appearance; dream, supernatural sight" (12c.), from Latin visionem (nominative visio) "act of seeing, sight, thing seen," noun of action from past-participle stem of videre "to see" (from PIE root *weid- "to see").
Also "a narrative account of a vision" (mid-14c.). By early 15c. as "a visual perception" (of something). The meanings "sense of sight, faculty that perceives by the eye;" also "act of seeing external objects" are recorded by late 15c.
In 20c. use, "distinct, vivid mental conception of a scheme or anticipation." The meaning "statesman-like foresight, political sagacity" is attested from 1926.
Proto-Indo-European root meaning "to see."
It might form all or part of: advice; advise; belvedere; clairvoyant; deja vu; Druid; eidetic; eidolon; envy; evident; guide; guidon; guise; guy (n.1) "small rope, chain, wire;" Gwendolyn; Hades; history; idea; ideo-; idol; idyll; improvisation; improvise; interview; invidious; kaleidoscope; -oid; penguin; polyhistor; prevision; provide; providence; prudent; purvey; purview; review; revise; Rig Veda; story (n.1) "connected account or narration of some happening;" supervise; survey; twit; unwitting; Veda; vide; view; visa; visage; vision; visit; visor; vista; voyeur; wise (adj.) "learned, sagacious, cunning;" wise (n.) "way of proceeding, manner;" wisdom; wiseacre; wit (n.) "mental capacity;" wit (v.) "to know;" witenagemot; witting; wot.
It might also be the source of: Sanskrit veda "I know;" Avestan vaeda "I know;" Greek oida, Doric woida "I know," idein "to see;" Old Irish fis "vision," find "white," i.e. "clearly seen," fiuss "knowledge;" Welsh gwyn, Gaulish vindos, Breton gwenn "white;" Gothic, Old Swedish, Old English witan "to know;" Gothic weitan "to see;" English wise, German wissen "to know;" Lithuanian vysti "to see;" Bulgarian vidya "I see;" Polish widzieć "to see," wiedzieć "to know;" Russian videt' "to see," vest' "news," Old Russian vedat' "to know."