Giant's Causeway
noun
a large body of basalt, unusual in displaying perfect columnar jointing, exposed on a promontory on the northern coast of Northern Ireland.
Origin of Giant's Causeway
First recorded in 1770–80
British Dictionary definitions for giant's causeway
Giant's Causeway
noun
a promontory of columnar basalt on the N coast of Northern Ireland, in Antrim: consists of several thousand pillars, mostly hexagonal, that were formed by the rapid cooling of lava and the inward contraction of the lava flow