1. Resembling a wedge. The sphenoid bone, the pterygoid bone at the anterior part of the basis of the skull, and wedging the other cranial bones firmly together.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• signoidal,
• spheecidae,
• spheciidae,
• sphecoida,
• alosphenoidal,
• aphenoidal,
• zphenoidal,
• xphenoidal,
• dphenoidal,
• ephenoidal,
• wphenoidal,
• sohenoidal,
• slhenoidal,
• s-henoidal,
• s0henoidal,
• spgenoidal,
• spbenoidal,
• spenoidal,
• spheniodal,
• sphenodial

The adjective form of the word "Sphenoidal" is "sphenoid".

The plural form of "sphenoidal" is "sphenoidals".

The singular form of the word "Sphenoidal" is "Sphenoid"