- sphenetitanite
- sphenicShaped like a wedge.
- spheno-Wedge, wedge-shaped.
- sphenogramA cuneiform character/symbol.
- tribosphenicDescribing the original placental molars that have a talonid in the lower molar teeth, where the protocone of the upper teeth hits. Definied by George Gaylord Simpson in 1936.