bio-code noun 2verb 1forms 3 noun2 •A biochemical signal or marker, especially one used for security purposes.Security features now being incorporated by the company include bar codes, deliberate errors, special background designs, micro-printing, UV-recognition and the use of bio-codes. — 1998 •A signal consisting of a biological action.Muse willed the change, swallowing and carefully constricting the epiglottis in a series of timed bio-codes that had taken her a long time to master. — 2011 verb1 •To mark using a bio-code.A system marking fuel with a chemical (bio-coding) has been put in place as a way of reducing fuel smuggling into the country. — 2000 formsbio-coded · bio-coding · bio-codes