We don't have synonyms for ice core yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ice cave, ice cube and ice cold.
(n) :
A core sample removed from an ice sheet, most commonly from the polar ice caps of Antarctica, Greenland or from high mountain glaciers elsewhere, the properties of which can be used to reconstruct a climatic record of a given area.
(n) :
A core sample removed from an ice sheet, most commonly from the polar ice caps of Antarctica, Greenland or from high mountain glaciers elsewhere, the properties of which can be used to reconstruct a climatic record of a given area.