Frozen dew that forms a white coating on a surface. Also called white frost.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hoarfrost" in a sentence
"I did have to look it up, not sure myself, but the explanation was simple really, frozen dew, but the word hoarfrost sounds much more mystical."
"The Artemisia reef, what a fun thing…I love the word hoarfrost, too."
"Having a hoarfrost is my absolute favorite thing about winter."