1. A sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
   - ethmoid sinus, ethmoidal sinus

Type of: sinus

• self-addressed
• self-aggrandisement
• self-aggrandising
• self-aggrandizement
• self-aggrandizing
• self-analysis
• self-annihilation
• self-appointed
• self-asserting
• self-assertion
• self-assertive
• self-assertiveness
• self-assurance
• self-assured
• self-aware
• self-awareness
• self-balancing
• self-catering
• self-centered
• self-centeredness
• self-centred
• self-centredness
• self-collected
• self-colored
• self-coloured