serac
A block or pinnacle of ice on a glacier, formed by intersecting crevasses. Technical term used in glaciology and mountaineering.
A huge serac towered over the glacier.
Compound of 氷 (ひょう, 'ice') and 塔 (とう, 'tower'), literally 'ice tower'. The term is a direct calque of the English 'serac' or French 'sérac', referring to a tower-like ice formation.