cune-, cuneo-, cunei- +

Wedge-shaped or shaped like a wedge.

Wedge-shaped, a reference especially to describe a leaf or petal base that is narrowly triangular.

1. With the narrowly triangular shape of a wedge.
2. Being a character, or characters, formed by the arrangement of small wedge-shaped elements and used in ancient Sumerian, Akkadian, Assyrian, Babylonian, and Persian writing.
3. A description of the clay tablets on which cuneiform script was written.
4. A description of any of three wedge-shaped bones of the ankle.
5. A wedge-shaped bone, especially one of three such bones in the tarsus of the foot.

Referring to the cuneiform and cuboid bones.

Any shape that is triangular in cross section: a wedge, wedge shaped, triangle, trigon, trilateral.