It means frosty, grayish, or white, as in hoary-headed or gray-headed. The original meaning was "white", but because of its use with white hair, it has the extended meaning of "old".
An aged person with white hair. The word hoary is also used to describe frost.
Hoary bat was created in 1796.
an extremely old dead body
The hoary old man shared stories of his youth with the children.
Hoary-headed Grebe was created in 1827.
Hawaiian hoary bat was created in 1890.
No need to give too much of a shock to their hoary old constitutions.
glory
"Hoary" means white, usually the whiteness of age. A "hoary old chestnut" is a story, joke, or song that has been told or sung so many times that it is well-known and familiar.
Hoary bats live in Hawaii. They can be found on nearly every island there, although they are considered secretive creatures.
Grayish-white.
The Hoary Head - 2013 was released on: USA: 9 May 2013 (DVD premiere)