MDI
Metered dose inhaler (MDI) means a handheld pressurized inhalation system that delivers small, precisely measured therapeutic doses of medication directly to the airways of a patient. MDIs treat health conditions such as asthma and chronic obstructive pulmonary disease and are approved for such use by the U.S. Food and Drug Administration (FDA).
Source
40 CFR § 84.3
Scoping language
As used in this subpart, the term: