英単語さくいん O（680語）
O で始まる英単語の一覧です。単語を押すと、意味・出てくるコース・キーボードでの打ち方が見られます。
- o'clock
- o/d on demand
- oarsmanship
- oath
- obamaesque
- obedient
- obese
- obesity
- obey
- obituary
- object
- object to
- objectify
- objection
- objectionable
- objective
- oblate
- obligation
- obligatory
- oblige
- oblique
- obliquity
- obliterate
- oblivion
- oblivious
- obloquy
- obnoxious
- obscene
- obscure
- obscurity
- obsequious
- obsequiously
- obsequiousness
- observable
- observance
- observant
- observation
- observatory
- observe
- obsess
- obsession
- obsolete
- obstacle
- obstacle to
- obstinate
- obstruct
- obstruction
- obtain
- obtainable
- obtrude
- obtrusion
- obtrusive
- obtusely
- obverse
- obviate
- obviation
- obvious
- obviously
- occasion
- occasional
- occasionally
- occult
- occupancy
- occupation
- occupied
- occupy
- occur
- occur to
- occurrence
- ocean
- oceanarium
- oceanaut
- oceania
- oceanographer
- oceanography
- oceanology
- octadecimally
- octagon
- octahedron
- octamerous
- octangular
- octapeptide
- octapole
- octarchy
- octasaccharide
- octastyle
- october
- octocentenary
- octonary
- octonion
- octopus
- ocular
- ocularist
- oculate
- oculist
- oculistics
- oculodermal
- oculofacial
- oculography
- oculogyration
- oculomotor
- oculomycosis
- oculonasal
- oculopupillary
- odd
- odd number
- odd-gon
- odds
- odds and ends
- ode
- odometer
- odontoblast
- odontogenesis
- odontogeny
- odontoid
- odontolith
- odontologist
- odontology
- odontonecrosis
- odontopathy
- odontophobia
- odontoplasty
- odontotherapy
- odor
- odyssey
- oenophile
- of
- of course
- of one's own
- of one's own accord
- off
- off duty
- off line
- off the hook
- off the mark
- off-campus
- offend
- offender
- offense
- offensive
- offer
- offering
- offhand
- offhand talk
- office
- office hour
- office supplies
- office worker
- officer
- official
- official discount rate
- official information
- officialdom
- officially
- offline
- offset
- offshoot
- offshore
- offspring
- often
- oh
- oh no.
- oil
- oilflation
- ointment
- okay.
- okra
- old
- old age pension
- old growth
- old-fangled
- old-fashioned
- oldish
- olfactory
- oligarch
- oligarchy
- oligoarthritis
- oligocarpous
- oligoelement
- oligopepsia
- oligophagous
- oligophagy
- oligopoly
- oligotrophy
- oligozoospermia
- olive
- olympic
- olympics
- ombrophyte
- omelet
- ominous
- ominously
- omission
- omissive
- omit
- omnibus
- omnichannel
- omnicide
- omniform
- omnigenous
- omniparity
- omnipotent
- omnipresent
- omniscience
- omniscient
- omnisex
- omnivore
- omnivorous
- on
- on a charge of
- on a cycle of
- on a regular basis
- on account of
- on and off
- on average
- on behalf of
- on board
- on business
- on display
- on duty
- on earth
- on end
- on foot
- on good terms
- on good terms with
- on hand
- on hold
- on occasion
- on one's cell-phone
- on one's own
- on one's own account
- on one's way
- on one's way to
- on purpose
- on sale
- on schedule
- on second thought
- on sight
- on the average
- on the block
- on the brink of
- on the contrary
- on the decline
- on the dot
- on the drawing board
- on the grounds that
- on the horizon
- on the hour
- on the internet
- on the loose
- on the nose
- on the other hand
- on the premises
- on the run
- on the same page
- on the sidelines
- on the spot
- on the verge of
- on the wagon
- on the way out
- on the whole
- on time
- on top of
- on vacation
- on-line scholarship
- on-site
- on-the-job training
- once
- once a week
- once again
- once and for all
- once in a while
- once in while
- once more
- one
- one after another
- one another
- one day
- one way
- one-third
- one-time
- one-way traffic
- oneself
- ongoing
- onion
- online
- onlooker
- only
- onomasiology
- onomastic
- onomasticon
- onomatology
- onomatophobia
- onomatopoeia
- onomatopoetic
- onomatopoiesis
- onset
- onshore
- ontic
- ontogeny
- ontological
- ontologize
- ontology
- onychitis
- onymous
- oocyte
- oogamy
- oolong tea
- oophagy
- oophorectomy
- oophoritis
- oosphere
- oospore
- ooze
- opacity
- opaque
- open
- open an account
- open house
- open one's eyes to
- opener
- opening
- opening remarks
- opening sale
- opera
- operand
- operant
- operate
- operating expenses
- operating system
- operation
- operational
- operative
- operator
- operetta
- ophthalmia
- ophthalmic
- ophthalmolith
- ophthalmology
- ophthalmoscope
- opinion
- opponent
- opportune
- opportunist
- opportunistic
- opportunity
- oppose
- opposed
- opposite
- opposition
- opposition party
- oppress
- oppression
- oppugn
- oppugnant
- opt
- optative
- optic
- optical
- optician
- optics
- optimal
- optimally
- optimism
- optimist
- optimistic
- optimization
- optimize
- optimized
- optimum
- option
- optional
- optometrist
- optometry
- opulent
- opus
- or
- or so
- or something
- ora
- oracle
- oracular
- oral
- oral cavity
- orange
- orate
- oration
- oratory
- orb
- orbicular
- orbicularity
- orbiculate
- orbit
- orbital
- orchard
- orchestrate
- ordain
- ordeal
- order
- order form
- order from
- orderly
- ordinal
- ordinal number
- ordinance
- ordinary
- ore
- organ
- organic
- organism
- organization
- organization chart
- organize
- organizer
- organonomy
- ori
- orient
- orientation
- orienteering
- orifice
- origin
- original
- original inhabitant
- originally
- originate
- originate from
- ornament
- ornamental
- ornithoid
- ornithological
- ornithologically
- ornithologist
- ornithology
- ornithomancy
- ornithophily
- ornithopod
- ornithopoda
- ornithoscopy
- orphan
- orphanage
- orthoclase
- orthodontics
- orthodontist
- orthodox
- orthoepy
- orthogenesis
- orthograph
- orthographer
- orthography
- orthokeratosis
- orthopedic
- orthopedics
- orthophoto
- orthopraxis
- orthopsychiatry
- orthopteran
- orthotherapy
- orthovoltage
- oscillate
- osmosis
- osteitis
- ostensibly
- ostentatious
- osteoblast
- osteology
- osteoma
- osteomalacia
- osteomyelitis
- osteopath
- osteopathy
- osteophage
- osteoporosis
- osteotome
- osteotomy
- ostracize
- ostrich
- other
- other people
- others
- otherwise
- otitis
- otodynia
- otoh on the other hand
- otolaryngology
- otolith
- otologist
- otology
- otorrhagia
- otosclerosis
- otoscopy
- ototoxicity
- otter
- ought
- ought to do
- ounce
- our
- ours
- ourselves
- oust
- out
- out and about
- out of blue
- out of control
- out of courtesy
- out of date
- out of hand
- out of malice
- out of order
- out of place
- out of pocket
- out of service
- out of stock
- out of the question
- out of turn
- out-of-pocket
- outage
- outbreak
- outburst
- outclass
- outcome
- outcrop
- outcry
- outdated
- outdistance
- outdo
- outdoor
- outfall
- outfight
- outfit
- outgoing
- outgrow
- outhit
- outlaw
- outlay
- outlet
- outlet store
- outline
- outlive
- outlook
- outlying
- outmaneuver
- outnumber
- outpace
- outpoint
- output
- outrace
- outrageous
- outrank
- outright
- outrun
- outsell
- outset
- outshine
- outside
- outskirts
- outsmart
- outspoken
- outstanding
- outtalk
- outthink
- outweigh
- outwit
- oval
- ovality
- ovalization
- ovalize
- ovaries
- ovary
- ovate
- ovation
- oven
- over
- over and over again
- over the counter
- over the edge
- over the top
- over there
- over time
- over-eager
- overage
- overall
- overanxious
- overbearing
- overboard
- overbook
- overcast
- overcharge
- overcoat
- overcome
- overcompensation
- overconfident
- overcook
- overcooked
- overcourteous
- overcurious
- overdo
- overdraw
- overdue
- overeat
- overestimate
- overexcite
- overexploit
- overexposure
- overgrowth
- overhaul
- overhead costs
- overhead projector
- overindulgent
- overinflation
- overkind
- overland
- overlap
- overload
- overlook
- overnight
- overpass
- overplay
- overplus
- overpopulation
- overproduction
- overprotective
- overreact
- overreaction
- override
- overripe
- overrule
- overrun
- overseas
- oversee
- overshadow
- oversight
- oversleep
- overstrain
- overstrict
- oversupply
- overt
- overtake
- overthrow
- overtime
- overtime pay
- overtolerance
- overture
- overturn
- overview
- overweight
- overwhelm
- overwhelming
- overwork
- overzealous
- ovicell
- ovicide
- oviduct
- oviform
- oviparity
- oviparous
- oviposit
- oviposition
- ovisac
- ovist
- ovogenesis
- ovoid
- ovoplasm
- ovule
- owe
- owe a to b
- owing to
- owl
- own
- owner
- ox
- oxidization
- oxidize
- oxycarpous
- oxygen
- oyster bed
- ozone
- ozone depletion
- ozone layer
- ozone layer depletion
- ozonosphere