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Definition: Sinusitis is a common condition in which the lining of the sinuses becomes inflamed.
Context: Mae angen i ymdrechion i wella presgripsiynu ganolbwyntio'n benodol ar heintiau'r pibellau anadlu isaf ac uchaf, heintiau'r llwybr wrinol, llid y glust ganol a llid y sinysau.
