a mark or impression of the ventral surface of the last joint of the thumb.

1895–1900; thumb + print Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thumbprint (ˈθʌmˌprɪnt)
See fingerprint an impression of the upper part of the thumb, used esp for identification purposes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
He had all of these details about my life, including my thumbprint.
And each performer will stick his own thumbprint on it and change it.
They'd download the parcel onto a card and lock it with a thumbprint.
The artist authenticated his work not by his signature but by his thumbprint.
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