Related Clues:

• Three: Pref.
• TNT starter
• ''Pod'' starter
• Penta- minus bi-
• Kind of pod?
• ''State'' starter
• Tetra- minus one
• 60% of penta-
• Motor or focal preceder
• Hexa- halved
• Start with athlete or cycle
• Prefix with cuspid
• Three, in word combinations
• Three, up front
• ''Angular'' prefix