si·nus·i·tis

[sahy-nuh-sahy-tis]
noun Pathology.
inflammation of a sinus or the sinuses.

Origin:
1900–05; < Neo-Latin; see sinus, -itis

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
sinusitis (ˌsaɪnəˈsaɪtɪs) [Click for IPA pronunciation guide]
 
n
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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00:10
Sinusitis is always a great word to know.
So is gobo. Does it mean:
the offspring of a zebra and a donkey.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Medical Dictionary

sinusitis si·nus·i·tis (sī'nə-sī'tĭs)
n.
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
If the taste problem is due to allergies or sinusitis, the doctor may give you
  medicine to relieve the stuffy nose.
He developed chronic sinusitis, and needed to get surgery to clean the
  infection.
Patients who do not respond or who have severe sinusitis should receive
  antibiotics.
The nasal spray may cause nosebleeds, sinusitis, and inflammation of the
  membranes in the nose.
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