tetrarch

Meanings

1. A governor or ruler of a quarter of a country, especially of a fourth part of a province in or client state of Ancient Rome.
2. Each of the four members of a jointly ruling tetrarchy, notably of the Roman Empire since Diocletian.
3. An officer in charge of a fourth part of a phalanx in Ancient Greece.

1. Having four vascular strands in a fibrovascular cylinder or stele.

Etymology

Borrowed from Latin tetrarchēs, from Ancient Greek τετράρχης (tetrárkhēs), from τετρα- (tetra-, “four”) + -άρχης (-árkhēs, “ruler, leader”).