skene-dhu

Noun

sgian dubh (plural sgian dubhs or sgians dubh or (rare) sgianan dubha)

1. (Scotland) A small, single-edged knife worn tucked into the hose (stocking) as part of traditional Scottish Highland dress along with the kilt.
   • [Y]oung Durward sprung lightly as the ounce up into the tree, drew from his pouch that most necessary implement of a Highlander or woodsman, the trusty skene dhu, and, calling to those below to receive the body on their hands, cut the rope asunder in less than a minute after he had perceived the...1823, [Walter Scott], “The Bohemians”, in Quentin Durward. […], volume I, Edinburgh: […] [James Ballantyne and Co.] for Archibald Constable and Co.; London: Hurst, Robinson, and Co., →OCLC, page 129