Definition of LUNG


Lung is a noun referring to a vital organ of the respiratory system found in humans and many other vertebrates. It involves several key aspects:

Anatomical Structure: Lungs are paired organs located within the thoracic cavity of the chest. Each lung is cone-shaped and spongy in texture, occupying the space on either side of the heart.

Respiratory Function: Lungs play a crucial role in the process of respiration, facilitating the exchange of oxygen and carbon dioxide between the air we breathe and the bloodstream. This exchange occurs through the network of small air sacs called alveoli within the lungs.

Breathing Mechanism: During inhalation, air enters the lungs through the trachea (windpipe), which branches into the bronchi and further into smaller bronchioles. These airways eventually lead to the alveoli, where oxygen diffuses into the bloodstream. During exhalation, carbon dioxide is expelled from the body as air is pushed out of the lungs.

Protection and Defense: Lungs are protected by the rib cage and are lined with a thin membrane called the pleura. They also contain specialized cells and mechanisms to defend against foreign particles, pathogens, and other harmful substances that may enter the respiratory system.

In summary, lungs are essential organs responsible for the exchange of oxygen and carbon dioxide during respiration. Their intricate structure and physiological function support the body’s vital processes and contribute to overall health and well-being.

LUNG un a sentence

  • Smoking can damage the delicate tissues of the lung.
  • The doctor listened to her lung sounds using a stethoscope.
  • The exchange of oxygen and carbon dioxide occurs in the alveoli of the lung.
  • Pneumonia is an infection that affects the lung tissue.
  • He struggled to catch his breath as pain shot through his injured lung.
  • The surgeon performed a lung transplant to replace the damaged organ.
  • Regular exercise can improve lung function and respiratory health.
  • The patient underwent a series of tests to assess the condition of his lungs.

Etymology of LUNG

The term lung has ancient linguistic origins, tracing back to Proto-Indo-European and evolving through various languages over time.

  • Proto-Indo-European Roots: The word “lung” likely originated from the Proto-Indo-European root *lengʷʰ-, meaning “light” or “lung.” This root gave rise to various cognates in different Indo-European languages, including the Old English “lungen” and the Latin “pulmo.”
  • Historical Significance: Lungs are essential organs in vertebrates, responsible for the exchange of oxygen and carbon dioxide in respiration. Throughout human history, the importance of lungs in sustaining life has been recognized across cultures and civilizations.
  • Semantic Evolution: The term “lung” has retained its anatomical meaning across languages and historical periods, referring to the pair of organs located in the chest cavity responsible for breathing and oxygenation.
  • Modern Usage: In contemporary usage, “lung” continues to denote the anatomical organ, with advancements in medical science leading to a deeper understanding of its structure, function, and role in health and disease.

The term lung thus reflects a linguistic journey from its Proto-Indo-European roots, through Old English and Latin influences, to its contemporary usage, where it signifies a vital organ involved in respiration and oxygen exchange.


  • Pulmonary
  • Respiratory
  • Pneumonic
  • Thoracic
  • Bronchial
  • Alveolar
  • Breathing
  • Pulmonal


  • Non-respiratory
  • Non-pulmonary
  • Extrathoracic
  • Abdominal
  • Non-breathing
  • Unventilated
  • Extrapulmonary
  • Non-thoracic


  • Respiratory system
  • Breathing
  • Oxygenation
  • Respiration
  • Pulmonology
  • Inhalation
  • Exhalation
  • Bronchus

🌐 🇬🇧 LUNG in other languages

Terms of Use

Privacy & Cookies


Who We Are

Main Sections


Geographical Locations



Let´s Talk



® 2024