exobiotic adjective 2noun 1forms 1 adjective2 •Of or pertaining to exobiology.Around me were computer databases filled with records of innumerable galaxies, exobiotic life forms and extraterrestrial cultures. — 2002 •From outside of an organism or from the substrate.Little is known about the clinical safety of exobiotic polymers. — 2012 noun1 •An exobiotic substance, especially one that influences the functioning of an organ or biological process.We have listed an example of an exobiotic which influences each identified step, but it should be remembered that this is far from an exhaustive list of the exobiotics which affect adrenal function. — 1996 formsexobiotics