a. 灰白的, 陈旧的

[医] 灰发的, 白发的

Hoary \Hoar"y\, a.
1. White or whitish. ``The hoary willows.'' --Addison.

2. White or gray with age; hoar; as, hoary hairs.

Reverence the hoary head. --Dr. T.
Dwight.

3. Hence, remote in time past; as, hoary antiquity.

4. Moldy; mossy; musty. [Obs.] --Knolles.

5. (Zo["o]l.) Of a pale silvery gray.

6. (Bot.) Covered with short, dense, grayish white hairs;
canescent.

{Hoary bat} (Zo["o]l.), an American bat ({Atalapha cinerea}),
having the hair yellowish, or brown, tipped with white.