from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Abnormally slow and shallow respiration, resulting in an increased level of carbon dioxide in the blood.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Respiratory depression, occurring when ventilation is inadequate to perform the necessary gas exchange, which may be caused by certain medical conditions, by holding one's breath, or by drug overdose.
hypo- + ventilation (Wiktionary)