English–Spanish dictionary: O
- oak
- oar
- oasis
- obedience
- obedient
- obelisk
- obese
- obesity
- obey
- obituary
- object
- objectify
- objectivity
- obligation
- obscene
- obsequious
- observation
- observational
- observatory
- observe
- observer
- obsess
- obsession
- obsessive
- obsolescence
- obstacle
- obstetrics
- obvious
- occasional
- occultist
- occupant
- ocean
- oceanic
- oceanographer
- oceanography
- ocher
- october
- octopus
- odd
- oenology
- of
- of course
- off-limits
- offend
- offer
- offering
- office
- office-use
- office worker
- official
- official gazette
- offset
- oh
- oh no
- oil
- oil lamp
- ointment
- okay
- old
- old age
- old man
- older
- olfactory
- oligopoly
- olive
- olive-colored
- olive tree
- olympic
- olympics
- ominous
- omit
- omnipresence
- on
- on purpose
- on the contrary
- on time
- on top of
- oncogene
- one
- one hundred
- one-liter bottle
- one's neighbor
- one second
- one-sided
- one tenth
- one third
- one-way trip
- onion
- only
- onomatopoeia
- open
- opening
- opera
- operate
- operating room
- operation
- ophthalmology
- opiner
- opinion
- opponent
- opponent of franco
- opportunity
- oppose
- opposite
- opposition
- oppression
- oppressive
- oppressor
- optician
- optimism
- optimistic
- optimization
- optimize
- option
- optional
- opulence
- oral
- orange
- orange blossom
- orange tree
- orchestra
- orchestra seats
- orchid
- ordeal
- order
- ordinal number
- ordinary
- oregano
- organ
- organic
- organism
- organization
- organizational
- organize
- organizer
- origin
- original
- originality
- originally from
- orisha
- ornamentation
- ornithologist
- ornithology
- orphan
- orphan girl
- orphanage
- orthodox
- orthodoxy
- orthopedics
- ostrich
- others
- our
- out
- out of it
- out of work
- outbound journey
- outburst
- outdated
- outfit
- outgoing
- outline
- outperform
- outrage
- outside
- outskirts
- outstanding
- oval
- oven
- over there
- overall
- overbearing
- overbooking
- overcoat
- overcome
- overdramatic
- overestimate
- overflow
- overflowing
- overlay
- overseas
- overtaking
- overthrow
- overturn
- overwhelm
- overwhelming
- owl
- own
- owner
- oxidative
- oxygen
- oxygenate
- oxygenation
- oyster
- ozone