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

• briefing
• briefless
• briefly
• briefness
• briefs
• brier
• brierpatch
• brierwood
• briery
• brig
• brigade
• brigadier
• brigadier general
• brigand
• brigandage
• brigandine
• brigantine
• Brigate Rosse
• Brigham Young
• bright
• bright as a new penny
• bright blue
• bright side
• bright spark
• Bright's disease