| respirator | the ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism or cell in a given period of time |
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| respirator | the rate at which a person inhales and exhales |
| respirator | a paramyxovirus that forms syncytia in tissue culture and that is responsible for severe respiratory diseases such as bronchiolitis and bronchial pneumonia (especially in children) |
| respirator | the system for taking in oxygen and giving off carbon dioxide |
| respirator | the passages through which air enters and leaves the body |
| respirator | any infection of the respiratory tract |