Thumbscrew
(n.) A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger.
(n.) An old instrument of torture for compressing the thumb by a screw; a thumbkin.
Similar Words:
Bethumb Hop-o'-my-thumb Hop-thumb Lady's thumb Northumbrian Tear-thumb Thumb Thumbbird Thumbed Thumbing