Browse the Oxford Advanced American Dictionary
- oppress
verb - oppressed
adjective - oppressive
adjective - oppressor
noun - opprobrium
noun - opt in
phrasal verb - opt out
phrasal verb - opt
verb - opt-out
noun - optic
adjective - optical
adjective - optical character recognition
noun - optical fiber
noun - optical illusion
noun - optician
noun - optics
noun - optimal
adjective - optimism
noun - optimist
noun - optimistic
adjective - optimize
verb - optimum
adjective - option
noun - option
verb - optional
adjective - optometrist
noun - optometry
noun - opulent
adjective - opus
noun - OR
abbreviation - or
conjunction - -or
suffix - oracle
noun - oracular
adjective - oracy
noun - oral
adjective - oral history
noun - oral
noun - oral surgeon
noun - oralism
noun - orange
adjective - orange
noun - orangeade
noun - orangery
noun - orangutan
noun - oration
noun - orator
noun - oratorical
adjective - oratorio
noun - oratory
noun
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