Etymology Lesson: hoarfrost
The other day, a client of mine mentioned seeing some spectacular hoarfrost on a trip to Canada, which got me thinking about the word hoarfrost. If you’ve not seen this phenomenon, its a form of frost caused by dew that rapidly freezes when it collects on vegetation or objects that are colder than the air. It forms feathery crystals that are stunningly beautiful and transform forests into icy winter fairy tale worlds.

So why is it called hoarfrost? The hoar in this word comes from hoary which means “venerable, grey haired, ancient.” You may recognize a similar sounding word Herr, which in German is a title of respect given to men. It has roots in an Old Norse word harr, meaning, “grey-haired, old.” And, according to Shipley, this word is related to the PIE root keiro, or koiro, which meant “grey, old, worthy.” So hoarfrost references the resemblance of this phenomenon to everything being covered in soft, feathery hair.
Frost comes from a Proto-Germanic word frustaz, and is pretty much the same word in all Germanic languages. The verb form of frustaz is freusanan, which meant “to freeze,” and can find its origin in the PIE root word preus-, which meant both “to freeze” and “to burn,” referring to the power cold has to both freeze and burn.
Here in New England, we have, thusfar, had a rather mild winter with not much snow or frost, which surely means we are about to get nailed with a huge storm any moment now!







