名詞 hoar:

1. ice crystals forming a white deposit (especially on objects outside)
   同義詞：frost, hoarfrost, rime

形容詞 hoar:

1. showing characteristics of age, especially having grey or white hair
   同義詞：grey, gray, grey-haired, gray-haired, grey-headed, gray-headed, grizzly, hoary, white-haired

1. The old man has hoar hair.
   那位老人頭發(fā)花白。
2. He told us a hoar old joke that we'd all heard many times before.
   他給我們講了一個我們都聽了很多次的老掉牙的笑話。

hoar

adj.（形容詞）
Hoary.
灰白的
n.（名詞）
Hoarfrost.
白霜

來源：
Middle English hor
中古英語 hor
from Old English h3r
源自 古英語 h3r