1. (noun) a smudge made by a (dirty) finger

• fingermark

1. (noun) a print made by an impression of the ridges in the skin of a finger; often used for biometric identification in criminal investigations

• biometric authentication
• biometric identification
• identity verification
• mark
• print

2. (noun) a generic term for any identifying characteristic

• identification

3. (noun) a smudge made by a (dirty) finger

• blot
• daub
• slur
• smear
• smirch
• smudge
• spot

4. (verb) take an impression of a person's fingerprints

• reproduce

1. (noun) a print made by an impression of the ridges in the skin of a finger; often used for biometric identification in criminal investigations

• loop
• thumbprint

1. (verb) take an impression of a person's fingerprints

• fingermark
• fingerprinting