| apnea | (noun) transient cessation of respiration | - |
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| dyspnea | (noun) difficult or labored respiration | Synonyms: dyspnoea |
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| eupnea | (noun) normal relaxed breathing | Synonyms: eupnoea |
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| hyperpnea | (noun) energetic (deep and rapid) respiration that occurs normally after exercise or abnormally with fever or various disorders | - |
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| hypopnea | (noun) slow or shallow breathing | - |
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| orthopnea | (noun) form of dyspnea in which the person can breathe comfortably only when standing or sitting erect; associated with asthma and emphysema and angina pectoris | - |
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