frost formed when thick fog freezes on cold objects
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Uses:
The night had been heavy and lowering, but towards the morning it had changed to a slight frost, and the ground and the trees were now covered with rime.
Thomas De Quincey. Confessions of an English Opium-Eater (1821)
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The winter was severe. The windows every morning were covered with rime, and the light shining through them, dim as through ground-glass, sometimes did not change the whole day long.