Source : Webster's Revised Unabridged Dictionary (1913)

Rimy \Rim"y\, a.
   Abounding with rime; frosty.

Source : WordNet®

rimy
     adj : covered with frost;  "a frosty glass"; "hedgerows were rimed
           and stiff with frost"-Wm.Faulkner [syn: {frosty}, {rimed}]
     [also: {rimiest}, {rimier}]