operculateoperculumopferkesselopheliaophicalciteophioiite complexophioliteophiolite suiteophiolitic suiteophiomorphaophiticophitic texture or ophitic or ophiticophiuchus or serpentis or serpentisophiuroidopisometeropisthostomaoppel or zoneopposite tideoptic angle or axial angle or axial angleoptic axial angleoptic axisoptic normaloptical axisoptical calciteoptical centeroptical diskoptical emission spectrometryoptical emission spectroscopyoptical glassoptical instrumentoptical mechanical sensoroptical microscope or microscope or microscopeoptical mineralogyoptical pathoptical plummet or autoplumb or autoplumboptical resolutionoptical sightoptical squareoptical systemoptical trainoptical twinning or chiral twinning or chiral twinningoptical wedgeoptical zoomoptically pumped magnetometoptimalizationoptimum alternativeoptimum depth of cutoptimum water contentoraloral cavity
