Medical term for tissue damage caused by extreme cold. In everyday use, 凍傷 typically refers to frostbite, while しもやけ is more common for chilblains.
登山中に凍傷にかかって、指の感覚がなくなった。
I got frostbite while mountain climbing and lost feeling in my fingers.
凍傷の治療には、ぬるま湯でゆっくり温めるのが良い。
For treating frostbite, it's good to warm the area slowly with lukewarm water.
凍死 means dying from exposure to cold, whereas 凍傷 is frostbite, localized tissue damage that does not by itself cause death.
frostbite victim; person with frostbite
Compound of 凍 (freeze) and 傷 (injury, wound). The reading is on'yomi for both characters.