noun. A common element in Celtic local and personal names, meaning ‘black,’ as in Dhu Loch, black lake; Roderick Dhu, black Roderick (Scott, Lady of the Lake).

"By the time I had gathered my wits sufficiently to wriggle out from under the defunct Harry, Arnold had joined his companion in death, throat neatly cut from ear to ear by the sgian dhu that Jamie carried in his stocking."

dubh