noun. inflammation of one of the paranasal sinuses.
1. Noun, singular or mass Symptoms of sinusitis include an ache or pressure across the midsection of the face, headache, nasal congestion, fever, loss of sense of smell, and a green or yellow nasal discharge. 2. Verb, non-3rd person singular present According to the University of Maryland Medical Center, researchers found that a daily irrigation of nasal passages with saline solution relieves sinusitis symptoms and reduces antibiotic use.