κρύος
krýos
“icy cold, frost”
4 words in English grow from this root.
Cryolite
Earthκρύοςkrýos
“frost stone”
Cryosphere
Earthκρύοςkrýos
“frost sphere”
Cryotherapy
Medicineκρύοςkrýos
“healing by cold”
Crystal
Earthκρύσταλλοςkrýstallos
“frozen thing”