-crat

1.
a combining form meaning “ruler,” “member of a ruling body,” “advocate of a particular form of rule,” used in the formation of compound words:
autocrat; technocrat.
Compare -cracy.
Origin
< Greek -kratēs as in autokratḗs autocrat; replacing -crate < French < Greek, as above
British Dictionary definitions for -crat

-crat

combining form
1.
indicating a person who takes part in or is a member of a form of government or class: democrat, technocrat See also -cracy
Derived Forms
-cratic, -cratical, combining_form:in_adjective
Word Origin
from Greek -kratēs, from -kratia-cracy