1. A Roman governor of the fourth part of a province; a petty prince.

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

• fetrarch,
• getrarch,
• yetrarch,
• 6etrarch,
• 5etrarch,
• twtrarch,
• tstrarch,
• tdtrarch,
• tetrrarch,
• teterarch,
• tetrearch,
• tetrarh,
• tetrrach,
• tetrarchh,
• Tetrarah,
• Tetrarach,
• Tetrearach,
• Tetrarchs,
• Tetrarche,
• Tetrarck

The plural of the "Tetrarch" can be the "tetrarches".

The singular of the "Tetrarch" can be the "Tetrarch".