O
- object speed limit
- object table
- ophthalmic lens
- Ophthalmometer
- Ophthalmoscope
- Ophthalmoscope graticules
- optical axis
- optical centre
- optical centre distance OCD
- optical dimensions
- optical material
- optical radiation
- Optical radiation hazard
- optical zone of magnifier
- Optimization
- Organic hard resin: thermoplastic hard resin
- Organic hard resin: thermosetting hard resin
Organic hard resin: thermosetting hard resin
Plastic material, consisting principally of organic polymers, that has been cured into a essentially infusible and insoluble state, and cannot be usefully reshaped on heating.