WordNet (r) 3.0 (2006):

biometrics
    n 1: a branch of biology that studies biological phenomena and
         observations by means of statistical analysis [syn:
         biometrics, biometry, biostatistics]

The Free On-line Dictionary of Computing (30 December 2018):

biometrics
biometric device

    The use of special input devices to
   analyse some physical parameter assumed to be unique to an
   individual, in order to confirm their identity as part of an
   authentication procedure.

   Examples include fingerprint scanning, iris recognition,
   facial recognition, voice recognition (speaker
   recognition), signature, vascular pattern recognition.

   (http://www.findbiometrics.com/Pages/guide2.html).

   (2007-02-22)