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pneumonitis

American

[noo-muh-nahy-tis, nyoo-] / ˌnu məˈnaɪ tɪs, ˌnyu- /

noun

Pathology.

inflammation of the lung caused by a virus or exposure to irritating substances.

pneumonitis British

/ ˌnjuːmɒnˈaɪtɪs /

noun

inflammation of the lungs

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of pneumonitis

From New Latin, dating back to 1815–25; see origin at pneumon-, -itis

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Following a pneumonitis event, the patient opted to withdraw from supported care, at which point his symptoms worsened until the patient died.

From Barron's • Apr. 28, 2026

Last year, an 11-year-old boy died in Delhi due to hypersensitivity pneumonitis - a disease that causes inflammation in lungs.

From BBC • Aug. 17, 2025

Lung alveoli are the small air sacs where oxygen and CO2 exchange between the lung and blood takes place, and the major site of radiation pneumonitis.

From Science Daily • Oct. 17, 2023

Depending on the dosage, it also can cause delayed pulmonary edema, pneumonitis, bronchitis and dental erosion.

From Seattle Times • Feb. 15, 2023

“Did it turn out to be pneumonitis? That’s what Mr. Pilsen thought.”

From "Do Androids Dream of Electric Sheep?" by Philip K. Dick

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023