Meaning

noun ice crystals forming a white deposit (especially on objects outside)

adjective showing characteristics of age, especially having grey or white hair; -Coleridge

originFrom Middle English hor, hore, from Old English hār (“hoar, hoary, grey, old”), from Proto-West Germanic *hair, from Proto-Germanic *hairaz (“grey”), from Proto-Indo-European *(s)ḱeh₃- (“grey, dark”). Cognate with German hehr (“noble, sublime”), Herr (“sir, gentleman”), Scottish Gaelic ciar (“dusky”), and Russian се́рый (séryj, “grey”).

Etymology from Wiktionary, CC BY-SA 3.0