Greyish-white frost (poetic) (4)
I believe the answer is:
hoar
(Other definitions for hoar that I've seen before include "Grey with age; frost" , "Greyish-white with age or frost" , "A kind of white frost" , "Type of frost" , "Rime" .)
I believe the answer is:
hoar
(Other definitions for hoar that I've seen before include "Grey with age; frost" , "Greyish-white with age or frost" , "A kind of white frost" , "Type of frost" , "Rime" .)