RIME

I. noun Etymology: Middle English rim, from Old English hrīm; akin to Old Norse hrīm frost Date: before 12th century frost 1b, an accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind, crust , incrustation , II. transitive verb (~d; riming) Date: circa 1755 to cover with or as if with ~, see: rhyme