[ˌheptədækˈtiliə]
七指(趾)畸形：同heptadactyly- orotate phosphoribosyltransferase (OPRT)
- orotic acid
- orotidine 5'-phosphate decarboxylase (ODC)
- orotidine 5'-phosphate pyrophosphorylase
- orotidylate decarboxylase
- orpanoxin
- orphenadrine
- orrho-
- orrhomeningitis
- orris
- Orr treatment (method,technic)
- Orsi-Grocco method
- orthesis
- orthetic
- orthetics
- orthetist
- ortho-
- ortho-acid
- orthoarteriotony
- orthobiosis
- orthocephalic
- orthocephalous
- orthochorea
- orthochromatic
- orthoclone OKT3