opal - p-el
- opalescence
- opalescent
- opaque
- open-hearth furnace
- open-hearth process
- optical activity
- optical conductance
- optical emission spectroscopy
- optical isomer
- optical isomerism
- optical multichannel analyzer
- optical rotation
- optically transparent electrode
- optimum
- optoacoustic spectroscopy
- orange
- orbital
- order
- ordered
- ordinate
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