I. ˈte.ˌträrk, ˈtē.ˌ- noun
( -s )
Etymology: Middle English, from Late Latin tetrarcha, from Latin tetrarches, from Greek tetrarchēs, from tetra- (akin to Greek tettares, tessares four) + -archēs -arch (I) — more at four
1. : a governor of the fourth part of an ancient province (as in the Roman Empire)
2. : a subordinate prince or petty king
3. : any of four officials or directors jointly in control
II. adjective
Etymology: tetra- + -arch
: having four xylem groups — used of a stele