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external constraint
external cost
external degree
external diseconomies of scale
external ear
external examination
external finance
external fixator
external respiration
external shock
externalism
externality
externalize
externe
exteroceptor
exterritorial
extinct
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external respiration
ex·ter·nal res·pi·ra·tion


noun 
Definition:
 
gas exchange between an organism and the atmosphere: the exchange of gases between an organism's respiratory system, e.g. the lungs in vertebrates, and the outside environment
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