Dictionary
thumbprint
noun thumb·print \ˈthəm-ˌprint\
: the pattern of marks made by pressing your thumb on a surface : a fingerprint made by a thumb
Full Definition of THUMBPRINT
1
: an impression made by the thumb; especially : a print made by the inside of the first joint
2
: something that identifies; especially : fingerprint 2a
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First Known Use of THUMBPRINT
1900
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