1. Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs 
2. Having, or composed of, four sides 
3. Having the form of the regular tetrahedron

Encyclopedia: Tetrahedral

• ravel
• ravel out
• ravelin
• raveling
• ravelling
• raven
• ravenala
• Ravenala madagascariensis
• ravener
• ravening
• Ravenna
• Ravenna grass
• ravenous
• ravenously
• ravenousness
• raver
• Ravi Shankar
• ravigote
• ravigotte
• ravin
• ravine
• raving
• raving mad
• ravingly
• ravioli