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The diagraph rh occurring at the beginning of a syllable in a word of Greek origin is ordinarily changed to rrh when a prefix or other lexical element is placed before it, as in this terminal form from rhoia.
A flowing; a flux.
[G. rhoia, a flow]

-rhea, -rrhea

suffix meaning "flow or discharge": galactorrhea, rhinorrhea.

-(r)rhea, -(r)rhoea, -(r)rhoeica

suffix meaning "fluid discharge, flow": anarrhea, cystirrhea, laryngorrhea.


Combining forms meaning flow or discharge.
Synonym(s): -rhoea.
[G. rhoia, a flowing]