A bishop in the Eastern Orthodox Church ranking immediately below a patriarch.
The ruler of a province in the Byzantine Empire.
[Late Latin exarchus, an overseer, from Greek exarkhos, from exarkhein, to lead : ex-, ex- + arkhein, to rule.] ex·arch'al adj., ex'ar'chate (ěk'sär'kāt), ex'ar'chy (-kē) n.
ex·arch 2 (ěk'särk') adj.
Botany Of or relating to a xylem whose early development is away from the center and toward the periphery.
[ex(o)- + Greek arkhē, beginning (from arkhein, to rule, begin).] ex'arch' n.