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 entrance to the Icehotel glows a mysterious bright blue: you are met with an ice pillared hallway complete with a grand ice chandelier.
The ice pillars are then put in place to give extra strength to the self-supporting snow arches.