acapnial
adj. C2 Proficiency acap·nial
adj. describing a situation where there is no carbon dioxide in the air. This is a very technical word used in science and medicine.
adj. containing no carbon dioxide. Typically used in medical or physiological contexts to describe the absence of carbon dioxide in the air or blood.
The patient was breathing acapnial air during the experiment.
In a controlled laboratory setting, the researchers monitored the subject's response to breathing acapnial gas to study lung function.
The acapnial environment created by the specialized mask allowed the divers to test their physiological limits without the usual buildup of carbon dioxide in their bloodstream.