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

• endwise
• ENE
• Enea Silvio Piccolomini
• enema
• enemy
• energetic
• energetically
• energetics
• energid
• energise
• energiser
• energising
• energize
• energizer
• energizing
• energy
• Energy Department
• energy level
• energy of activation
• Energy Secretary
• energy state
• energy unit
• energy-absorbing
• energy-releasing
• energy-storing