ヒョウ, こおり, ひ, こお.る, すい
icicle, ice, hail, freeze, congeal
JLPT2 G3 S5 F1450
The relevant seal inscription form shows cracks spreading over the ice of a river frozen in winter → *ice* → *be frozen*; *freezing cold*. In dual-element characters such as 凍 凅 and 凋, 氷 appears in the form 冫.
[Full Kanji Etymology List]