hairline
Refers to the line where the forehead meets the hair. Used in everyday contexts.
My hairline has started to recede.
彼女は額際の産毛がきれいだ。
The fine hairs along her hairline are beautiful.
Compound of 額 (ひたい, 'forehead') and 際 (ぎわ, 'edge, border'). The reading ぎわ is a rendaku form of きわ.