noun. A device that detects, records, and transmits information regarding a physiological change or process.

noun. A device that uses biological materials, such as enzymes, to monitor the presence of various chemicals in a substance.

noun. Any device that detects, records or transmits physiological data, especially data concerning the presence of chemical compounds (analytes)

noun. A device that uses biological material (e.g. microorganisms, oligonucleotides, enzymes, antibodies) to detect other biological molecules or chemicals.

"An electronic biosensor is printed on the waistband and measures blood pressure, heart rate and other vital signs through constant contact with the skin."