| opprobrious | injurieux |
| opprobrium | opprobre |
| Oprah Winfrey | Oprah Winfrey |
| Oprichnik | Oprichnik |
| Oprichnina | Opritchnina |
| Ops | Ops |
| opt | opter |
| Opteron | Opteron |
| optic | optique |
| Optic radiation | Radiation optique |
| optical | optique |
| Optical brightener | Agent azurant |
| Optical bursts | Sursaut optique |
| Optical components | Composant optique |
| Optical counterparts | Contrepartie optique |
| Optical density | Absorptivité molaire |
| Optical depth | Profondeur optique |
| Optical digital data disk | Don |
| Optical digital disk | Don |
| Optical disc authoring | Gravure |
| Optical disc authoring software | Logiciel de gravure |
| Optical disc drive | Graveur de disque optique |
| Optical disc recording modes | Disk-At-Once |
| Optical double stars | Etoile double optique |
| Optical equipment | Equipement optique |
| Optical fiber | Fibre optique |
| Optical fibers | Fibre optique |
| Optical films | Film optique |
| Optical filters | Filtre optique |
| Optical flares | Eruption optique |
| Optical identifications | Identification optique |
| optical illusion | illusion d'optique |
| Optical interferometers | Interferometre optique |
| Optical interferometry | Interferometrie optique |
| Optical mark recognition | Reconnaissance optique de marques |
| Optical materials | Materiau optique |
| Optical microscope | Microscope optique |
| Optical observations | Observation optique |
| Optical observatories | Observatoire optique |
| Optical parametric oscillator | Oscillateur paramétrique optique |
| Optical path length | Différence de marche |
| Optical pathlength | Chemin optique |
| Optical positions | Position optique |
| Optical pulsars | Pulsar optique |
| Optical radar | Radar optique |
| Optical rotation | Pouvoir rotatoire |
| Optical scanners | Scanner optique |
| Optical spectrometers | Spectrometre optique |
| Optical spectroscopy | Spectroscopie optique |
| Optical systems | Systeme optique |
| Optical telescopes | Telescope optique |
| Optical testing | Test optique |
| Optical thickness | Epaisseur optique |
| Optical transfer function | Fonction de tranfert optique |
| Optical windows | Fenetre optique |
| optician | opticien |
| optics | optique |
| optimal | optimal |
| Optimates | Optimates |
| Optimation | Optimisation |
| optimism | optimisme |
| optimist | optimiste |
| optimistic | optimiste |
| Optimization | Optimisation |
| optimize | optimiser |
| Optimized Link State Routing protocol | Optimized link state routing protocol |
| optimum | optimal |
| Optimus keyboard | Optimus |
| option | option |
