1. (

• frost ,
• hoar ,
• hoarfrost ,
• rime

) ice crystals forming a white deposit (especially on objects outside) ;

1. (

• grey ,
• gray ,
• grey-haired ,
• gray-haired ,
• grey-headed ,
• gray-headed ,
• grizzly ,
• hoar ,
• hoary ,
• white-haired

) showing characteristics of age, especially having grey or white hair; "whose beard with age is hoar"-Coleridge; "nodded his hoary head" ;