Final answer:
An air passage beneath a nasal concha within the nasal cavity is referred to as a meatus.
Step-by-step explanation:
The air passage beneath a nasal concha within the nasal cavity is referred to as a meatus. Meatuses are recesses attached to the conchae that increase the surface area of the nasal cavity. They help to swirl the incoming air, warm and moisturize it, and allow mucus to trap dust and pollutants.