voiceprint noun

1. a printed record of a person’s speech, showing the different frequencies and lengths of sounds as a series of waves
   Word Origin1960s: from the noun voice, on the pattern of fingerprint.

[TahlilGaran] English Dictionary ▲

voiceprint
n., technological, colloquial The graphic pattern derived from converting an individual's voice into a visible graph used by the police for identification purposes, much as fingerprints.
They have succeeded in identifying the murderer by using a voiceprint.

[TahlilGaran] English Idioms Dictionary ▲