Conchae are the plural of concha, bony structures inside the nasal cavity that swipe and warm inhaled air. In anatomy, they refer specifically to the curled shelves of bone and cartilage (superior, middle, and inferior) that increase surface area for filtration and humidification. The term is used mainly in medical and anatomical contexts and is pronounced with careful attention to the 'con-' + 'chae' syllables.
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