tetrarch adjective. ['tɛtrɑ:k] L19.
[from TETRA- + Greek arkhē beginning.]
Botany. Of a vascular bundle: having four strands of xylem, formed from four points of origin.

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tetrarch noun. ['tɛtrɑ:k] OE.
[Late Latin tetrarcha, classical Latin tetrarches from Greek tetrarkhēs: see TETRA-, -ARCH.]
1. Roman History. A ruler of any of four divisions of a country or province; a ruler subordinate to Rome, esp. in Syria. OE.
2. transf. Any ruler of one of four divisions, elements, etc.; any subordinate ruler. E17.
3. Each of four joint rulers, heads, etc. M17.

■ tetrarchate ['tɛtrǝkeɪt] noun the office or position of a tetrarch M17.

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