-rrhea

1.
a combining form meaning “flow,” “discharge,” used in the formation of compound words:
gonorrhea.
Also, -rhea.
Compare rheo-.
Origin
< Neo-Latin -rrhoea < Greek -rrhoia, combining form representing rhoía a flow, akin to rheîn to flow, stream
British Dictionary definitions for -rrhea

-rrhoea

combining form
1.
(in pathology) a discharge or flow: diarrhoea
Word Origin
from New Latin, from Greek -rrhoia, from rhoia a flowing, from rhein to flow
-rrhea in Medicine

-rrhea suff.
Flow; discharge: seborrhea.