noun
the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing
• Syn: ↑respiratory system
• Hypernyms: ↑system
• Part Holonyms: ↑body, ↑organic structure, ↑physical structure
• Part Meronyms: ↑respiratory tract, ↑airway, ↑respiratory organ, ↑trachea
Useful english dictionary. 2012.