ice pillar

ice pillar

[′īs ‚pil·ər]
(hydrology)
A column of glacial ice covered with stones or debris which tend to protect the ice from melting.
References in periodicals archive ?
On a hot, humid day, ice pillars were set up at the Nippon Budokan where the ceremony was held, because the use of air conditioning was reduced to conserve energy.
The ice pillars are then put in place to give extra strength to the self-supporting snow arches.
After a brisk trot around the crater rim, past looming ice pillars and glacier remnants and through a few late snowdrifts, we taken an exhilarating bound down a scree slope.