- on the table
- on_license
- only an instrument
- only instrumental
- oldfield
- one who holds
- out of character
- other's interest
- ofttimes
- outport
- outwork
- one who does not believe in religious ties
- of two years
- of unimpeachable character
- ordained by the vedas
- ontology
- orczy
- ornamental
- ornamental gift for the bride (from the bride_ groom's side)
- ornamental make_up
- ornamental gift presented to the bride (from the bridegroom's side)
- obsteric shock
- oral roberts
- oral smear
- one who has survived only through name
- one's honour to be sullied
- orientated
- outgoings
- operations control
- operations multitask
- operating pressure
- outfitting
- one who accumulates
- on head be it
- optative
- on sufferance
- on_going
- orly
- orlon
- overstep
- olfactory receptive centre
- olfactory sulcus
- olfactory placode
- on the road_side
- on the right track
- on top of the world
- one who praises
- operating budget
- orange peel
- out of head