improvement - the act of improving something; "their improvements increased the value of the property"

mechanical system - a system of elements that interact on mechanical principles

ventilation shaft - a shaft in a building; serves as an air passage for ventilation

ventilator - a device (such as a fan) that introduces fresh air or expels foul air

give-and-take, discussion, word - an exchange of views on some topic; "we had a good discussion"; "we had a word or two about it"

artificial respiration - an emergency procedure whereby breathing is maintained artificially

abdominal breathing - breathing in which most of the respiratory effort is done by the abdominal muscles; "abdominal breathing is practiced by singers"

eupnea, eupnoea - normal relaxed breathing

hyperpnea - energetic (deep and rapid) respiration that occurs normally after exercise or abnormally with fever or various disorders

hypopnea - slow or shallow breathing

hyperventilation - an increased depth and rate of breathing greater than demanded by the body needs; can cause dizziness and tingling of the fingers and toes and chest pain if continued

panting, heaving - breathing heavily (as after exertion)

Cheyne-Stokes respiration, periodic breathing - abnormal respiration in which periods of shallow and deep breathing alternate

smoking, smoke - the act of smoking tobacco or other substances; "he went outside for a smoke"; "smoking stinks"

breathing out, exhalation, expiration - the act of expelling air from the lungs

snoring, stertor, snore - the act of snoring or producing a snoring sound

sniffle, snuffle, snivel - the act of breathing heavily through the nose (as when the nose is congested)

wheeze - breathing with a husky or whistling sound

second wind - the return of relatively easy breathing after initial exhaustion during continuous exertion

breathing in, inhalation, aspiration, inspiration - the act of inhaling; the drawing in of air (or other gases) as in breathing

bodily function, bodily process, body process, activity - an organic process that takes place in the body; "respiratory activity"