oppo - oyst
- oppose
- opposed
- opposed bellows
- opposed impellers
- opposed mode photoelectric sensor
- opposed mounting
- opposed piston engine
- opposed sensor
- opposed-action screen
- opposed-mode interference
- opposed-mode interference suppression
- opposed-piston engine
- opposed-ram steering gear
- opposing field
- opposing impellers
- opposing magnetic field of armature
- opposing reaction
- opposing train
- opposing winding
- opposite
- opposite angle
- opposite curve
- opposite cutting edge
- opposite direction
- opposite flank
- opposite in rotation
- opposite leg
- opposite phase
- opposite pole
- opposite pole quadrilateral
- opposite prompt side
- opposite rotation
- opposite side
- opposite sign
- opposite-sense
- oppositely charged
- oppositely wound
- opposition
- opposition method
- optic
