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sinusitis

American  
[sahy-nuh-sahy-tis] / ˌsaɪ nəˈsaɪ tɪs /

noun

Pathology.
  1. inflammation of a sinus or the sinuses.


sinusitis British  
/ ˌsaɪnəˈsaɪtɪs /

noun

  1. inflammation of the membrane lining a sinus, esp a nasal sinus

"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 sinusitis

From New Latin, dating back to 1900–05; see origin at sinus, -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.

See Examples For:

Pharmacists can already prescribe medication for seven conditions - sore throat, earache, sinusitis, shingles, impetigo, infected bites and urinary tract infections.

From BBC ● Sep. 10, 2026

Antibiotic use is driven largely by common colds, which produce secondary bacterial things like sore throat, earache, nasal congestion, sinusitis.

From Slate ● Oct. 8, 2025

Although over-the-counter nasal sprays offer marginal relief, no FDA-approved medication exists for the most common form of the condition, chronic rhinosinusitis without nasal polyps, known as "chronic sinusitis."

From Science Daily ● Jan. 18, 2024

Their youngest son, James, also was diagnosed with pneumonia, while Silva and their other son, Alexander, struggled with sinusitis and ear infections.

From Los Angeles Times ● Feb. 21, 2023

His most troubling conditions were a strangely recurrent viral pneumonia, chronic sinusitis, and the ulcerative colitis that had laid him low the weekend before his scheduled testimony against Oppenheimer.

From "Big Science" by Michael Hiltzik

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