Noun

1. A deep cleft formed in limestone surfaces due to water erosion; providing a unique habitat for plants

   • 1922: He climbed over the sedge and eely oarweeds and sat on a stool of rock, resting his ashplant in a grike. — James Joyce, Ulysses
   • 1973: The Crag is a sort of crag-shaped feature of limestone, rich in minerals and seamed with crevasses or ‘grikes’ as they call them hereabouts. — Kyril Bonfiglioli, Don't Point That Thing at Me (Penguin 2001, p. 157)