thumbscrew

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thumbscrew

1. an instrument of torture that pinches or crushes the thumbs
2. a screw with projections on its head enabling it to be turned by the thumb and forefinger
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

thumbscrew

[′thəm‚skrü]
(design engineering)
A screw with a head flattened in the same axis as the shaft so that it can be gripped and turned by the thumb and forefinger.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

thumbscrew

A screw having a broad head that is knurled or flattened so that it may be turned easily by the thumb and one finger.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.