hoar (
http://definr.com/hoar)
adj : showing characteristics of age, especially having gray or
white hair; "whose beard with age is hoar"-Coleridge;
"nodded his hoary head" [syn:
gray,
grey,
gray-haired,
grey-haired,
gray-headed,
grey-headed,
hoary,
white-haired]
n : ice crystals forming a white deposit (especially on objects
outside) [syn:
frost,
hoarfrost,
rime]