si·nus·i·tis 
(sī′nə-sītĭs)
(sī′nə-sītĭs)n.
Inflammation of the sinuses or a sinus, especially in the nasal region.
- attestation
- attester
- attestor
- Att. Gen.
- at that
- at the dot
- at the double
- at the drop of a hat
- at the drop of a hat
- at the end of one's rope
- at the end of (one's) rope/tether
- at the end of one's tether
- at the end of rope
- at the end of tether
- at the end of the day
- at thehand
- at thehand/handsof
- at the latest
- at the mercy of
- at (the) most
- at the most
- at the ready
- at the same time
- at the top of lungs
- at the top of (one's) lungs