A sinus was an anatomical feature of the nose found in several species. They were known to get congested, though they could be cleared, for example using Ferengi Beetle snuff.
In the mirror universe, Klingon Regent Worf found his sinuses to be clear for the first time in years after trying such beetle snuff in 2375. (DS9: "The Emperor's New Cloak")
Kali-fal, a Romulan beverage, was also known for opening sinuses, even before the first sip, due to its strong aroma. (DS9: "In the Pale Moonlight")
External link Edit