Underbrow

The Friar's eyes now seemed to burn no more with light, but looked out stern beneath his underbrow's concave; his voice was grave; he stood erect as if to soar above his natural height:

Source: wiktionary

A distinctive feature is the sharply defined underbrow which extends downward over an upper cheek bulge at the outer corner of the orb.

Source: wiktionary

Some women need a highlighter shadow on the underbrow, a second shadow on the orbital bone, and a third on the lid.

Source: wiktionary

Her big eyes are framed with brows that are almost bushy— the top part of the brow is left alone, only the underbrow is tweezed to give the brow an "angle."

Source: wiktionary