rime

riimi

riimittää

kuura, huurre

rimmata puhekieltä ice Ice formed by the rapid freezing of cold water droplets of fog onto a cold surface.
De Quincey

The trees were now covered with rime.

I rose, put on my shoes, and began to walk up and down the floor to try and warm myself. I looked out; there was rime on the window; it was snowing.

(rfquotek)

Samuel Taylor Coleridge wrote The Rime of the Ancient Mariner in the 18th century.

Þatt full wel iss bitacnedd Þurrh tale & rime off fowwerrtiȝ, Off fowwerr siþe tene. — Ormulum, c1200

(That full well is betokened thru tale and the number of forty, of four times ten.)