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1. the intake and expulsion of air during respiration
2. the air inhaled or exhaled during respiration
3. a single respiration or inhalation of air, etc

What does it mean when you dream about breath?

Many people have problems breathing during sleep, even if they do not have full-blown apnea, and this can be reflected in one’s dream life. If not an apnea symptom, holding one’s breath in a dream represent an expression of will, or repressing one’s anxieties or emotions. Breathing is also central to an unusually large number of idioms: “a breath of fresh air,” “a waste of breath,” “take your breath away,” “catch your breath,” “out of breath,” and the like, any one of which could find expression in one’s dreams.

References in periodicals archive ?
Carbon monoxide was measured in the exhaled air of all the professionals who worked in the ICUs in order to ascertain tobacco use with greater reliability.
When the exhaled warm and moisturised air passes over the surface of the nasal mucosa that has been cooled by the cold air on its way into the lungs, it condenses, just as it does if you blow exhaled air towards the colder surface of a window pane or a mirror.
Figure 4 shows that when there is no downward plane jet between the two breathing thermal manikins, the exhaled air from the source manikin can easily approach the breathing zone of the target manikin.
Oksala said however, exhaled air is a problematic sample material since it requires good cooperation and technique from the patient and immediate analysis, while urine is simple to attain and store, and is therefore more feasible in clinical practice.
Measurements of nitric oxide in exhaled air were characterized by the highest specificity and sensitivity in the diagnosis of asthma.
When exhaled air blows through them, they vibrate or "flutter" to produce sounds.
The results' show that the use of mouth covering can interrupt the horizontal transportation of exhaled air to protect the co-occupant from direct exposure to the coughed droplets for all systems, but the effects on the later-stage indirect exposure of the co-occupant are very different for the three ventilation systems.
The entrainment also cools the exhaled air puff along its way.
Summary: TEHRAN (FNA)- Malaria mosquitoes utilize CO2 from exhaled air to localize humans from afar.
By spirometric testing, one measures the inhaled and exhaled air volume, in a certain time lapse.
Exhaled air, whether free, phonated, or otherwise impeded, moves from high pressure to low pressure.
One irksome issue needs noting: There is an entire page extolling the wonder of CCRs (closed-circuit rebreather units), which recycle a diver's exhaled air so that bubbles are not released into the water.