Definition of "knuckly"

a rock-face whose crown overhung its base and whose extensive surface was knuckly with the clay nests of innumerable martins

1950, Mervyn Peake, Gormenghast, London: Eyre & Spottiswoode

At the far end of the houses the head gardener stood waiting for his mistress, and he gave her strips of bass to tie up her nosegay. This she did slowly and laboriously, with knuckly old fingers that shook.

1918, W[illiam] B[abington] Maxwell, chapter XIX, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company