Thumb″screw′ (?), n. 1. A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger.
2. An old instrument of torture for compressing the thumb by a screw; a thumbkin.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.