noun Pathology.
inflammation of a sinus or the sinuses.

1900–05; < Neo-Latin; see sinus, -itis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sinusitis (ˌsaɪnəˈsaɪtɪs)
inflammation of the membrane lining a sinus, esp a nasal sinus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

sinusitis si·nus·i·tis (sī'nə-sī'tĭs)
Inflammation of the mucous membrane of a sinus, especially of the paranasal sinuses.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He developed chronic sinusitis, and needed to get surgery to clean the
Sinusitis can also be dangerous if it persists and the infection spreads.
If the taste problem is due to allergies or sinusitis, the doctor may give you
  medicine to relieve the stuffy nose.
The nasal spray may cause nosebleeds, sinusitis, and inflammation of the
  membranes in the nose.
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