bullaun

plural bullauns

1. A natural depression in a stone, often filled with water and sometimes pebbles.

   And Castledawson we'll enlist And Upperlands, each planted bawn- Like bleaching-greens resumed by grass-

   1972, Seamus Heaney, "A New Song", Wintering Out, Faber and Faber (1972)

   1 more example

   For when he shuffles across the esker I glimpse my grandfather’s whiskers stained with tobacco-pollen. When he piddles against a bullaun I know he carries bovine TB

   1987, Paul Muldoon, "Brock", Meeting The British, Faber and Faber (1987)