氷

ice; icicle; hail; freeze; congeal

5 strokes. Taught in grade 3. Newspaper frequency rank 1450.

Readings

こおり (kun reading): 氷 (こおり) ice; かき氷 (かきごおり) shaved ice (usually served with flavored simple syrup)
ヒョウ (on reading): 氷河 (ひょうが) glacier; 氷点下 (ひょうてんか) below freezing
ひ (kun reading): 氷室 (ひむろ) ice house; 氷雨 (ひさめ) hail
こおる (kun reading)

氷 (こおり) ice
かき氷 (かきごおり) shaved ice (usually served with flavored simple syrup)
氷水 (こおりみず) ice water
氷枕 (こおりまくら) cooling pillow (often rubber)
棚氷 (たなごおり) ice shelf
氷河 (ひょうが) glacier
氷点下 (ひょうてんか) below freezing
氷期 (ひょうき) glacial period
氷河期 (ひょうがき) glacial period
氷柱 (ひょうちゅう) icicle
氷室 (ひむろ) ice house
氷雨 (ひさめ) hail
氷頭 (ひず) thinly sliced salmon head cartilage (also whale etc.)
氷魚 (ひうお) whitebait
魚氷に上る (うおひにのぼる) third climate of spring (when the ice breaks and fish start appearing near the surface)
碓氷峠 (うすいとうげ) Usui Pass

175 words in all.