screw shackle (skroshak"l)

A shackle of which the shackle-bolt is screwed into place. screw-shell (skrö'shel), n. A gastropod of the family Turritellidæ. P. P. Carpenter. screw-spike (skrö'spīk), n. A cylindrical spike having a screw-thread cut on a part of its stem. It is driven partly in, and then screwed home. E. H. Knight. screw-stair (skröʻstar), n. A spiral or winding staircase; a hanging-stair. He was a bachelor, and lived in a very small house, above his shop, which was reached by a screw - stair. N. McLeod, The Starling, xxv.