noun
ears; the bottom of the ear
Literary or formal term for the ears, often used in expressions like 耳底に残る (to linger in one's ears). Not an everyday word for 'ear' (耳).
その旋律が耳底に残っている。
The melody lingers in my ears.
彼の言葉は今も耳底から離れない。
His words still stay in my ears.