‘耳廓’ (ěr kuò) refers specifically to the visible, outer part of the human ear—the cartilaginous structure that collects sound waves and channels them into the ear canal. The character 耳 means 'ear', while 廓 means 'outline', 'contour', or 'outer frame', so together they literally denote 'the outer contour of the ear'. This term is anatomical and precise, used primarily in medical, biological, or health-related contexts—not in casual daily speech.

In clinical practice, doctors examine the shape, symmetry, and integrity of the 耳廓 during physical assessments, especially for congenital conditions (e.g., microtia) or trauma. It’s distinct from related terms like ‘耳道’ (ear canal) or ‘耳垂’ (earlobe), which refer to specific subparts. While laypeople may simply say ‘耳朵’ (ear) in everyday conversation, 耳廓 appears in textbooks, patient records, and professional discussions where anatomical accuracy matters.