poro-comb. form
Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g.
porokeratosis n.Origin: Of multiple origins. A borrowing from Greek. Partly also a borrowing from Latin. Etymons: Greek πόρος; Latin poro-.
Etymology: < ancient Greek πόρος (see pore n.1; compare -o- connective); occasionally via scientific Latin poro- (in e.g. porophyllus : see porophyllous adj.). Compare Hellenistic Greek πορο-, combining form (in e.g. ποροποιεῖν to open the pores, ποροποιία state of the pores) of ancient Greek πόρος.First recorded in the second half of of the 17th cent. in an isolated formation (porology n.). Further formations are found from the mid 19th cent. (e.g. porophyllous adj., poroplastic adj.). Combining with second elements ultimately of Greek origin.
This is a new entry (OED Third Edition, December 2006; most recently modified version published online March 2020).