Word Games Pro · Verified word lists
12 Letter Words Starting With O
Browse 12 Letter Words Starting With O. 102 verified words are currently available. Definitions, Scrabble scores, and links to complete dictionary entries are included.
12 Letter Words
- oblanceolate 12 letters · 16 points (of a leaf shape) having a broad rounded apex and a tapering base
- obligational 12 letters · 15 points relating or constituting or qualified to create a legal or financial obligation
- obligatorily 12 letters · 18 points in a manner that cannot be evaded
- obligingness 12 letters · 16 points a disposition or tendency to yield to the will of others
- obliteration 12 letters · 14 points destruction by annihilating something
- obscurantism 12 letters · 18 points a deliberate act intended to make something obscure
- obscurantist 12 letters · 16 points a person who is deliberately vague
- obsequiously 12 letters · 26 points in an obsequious manner
- obsolescence 12 letters · 18 points the process of becoming obsolete; falling into disuse or becoming out of date
- obsoleteness 12 letters · 14 points the property of being out of date and not current
- obstetrician 12 letters · 16 points a physician specializing in obstetrics
- obstreperous 12 letters · 16 points boisterously and noisily aggressive
- occasionally 12 letters · 19 points sporadically and infrequently
- occupational 12 letters · 18 points of or relating to the activity or business for which you are trained
- oceanography 12 letters · 23 points the branch of science dealing with physical and biological aspects of the oceans
- octogenarian 12 letters · 15 points being from 80 to 89 years old
- octosyllabic 12 letters · 21 points having or characterized by or consisting of eight syllables
- octosyllable 12 letters · 19 points a verse line having eight syllables or a poem of octosyllabic lines
- oesophagitis 12 letters · 18 points inflammation of the esophagus; often caused by gastroesophageal reflux
- officeholder 12 letters · 24 points the official who holds an office
- oligarchical 12 letters · 20 points of or relating to or supporting or characteristic of an oligarchy
- oligodactyly 12 letters · 22 points congenital condition in which some fingers or toes are missing
- oligodendria 12 letters · 15 points tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers
- oligospermia 12 letters · 17 points insufficient spermatozoa in the semen
- ombudsperson 12 letters · 19 points a government appointee who investigates complaints by private persons against the government
- ommastrephes 12 letters · 21 points extremely active cylindrical squid with short strong arms and large rhombic terminal fins
- omnipresence 12 letters · 18 points the state of being everywhere at once (or seeming to be everywhere at once)
- oneiromancer 12 letters · 16 points someone who divines through the interpretation of dreams
- onomatomania 12 letters · 16 points obsession with a particular word which the person uses repeatedly or which intrudes into consciousness
- onomatopoeia 12 letters · 16 points using words that imitate the sound they denote
- onomatopoeic 12 letters · 18 points (of words) formed in imitation of a natural sound
- onychophoran 12 letters · 25 points any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid…
- oophorectomy 12 letters · 24 points surgical removal of one or both ovaries
- ophthalmitis 12 letters · 22 points severe conjunctivitis
- opinionative 12 letters · 17 points obstinate in your opinions
- opisthotonos 12 letters · 17 points severe spasm in which the back arches and the head bends back and heels flex toward the back
- oppositeness 12 letters · 16 points the relation between opposed entities
- oppressively 12 letters · 22 points in a heavy and oppressive way
- opsonisation 12 letters · 14 points process whereby opsonins make an invading microorganism more susceptible to phagocytosis
- opsonization 12 letters · 23 points process whereby opsonins make an invading microorganism more susceptible to phagocytosis
- optimisation 12 letters · 16 points the act of rendering optimal
- optimization 12 letters · 25 points the act of rendering optimal
- orchestrated 12 letters · 18 points arranged for performance by an orchestra
- orchestrator 12 letters · 17 points an arranger who writes for orchestras
- orchidectomy 12 letters · 25 points surgical removal of one or both testicles
- ordinariness 12 letters · 13 points the quality of being commonplace and ordinary
- organicistic 12 letters · 17 points relating to or tending toward organicism
- organisation 12 letters · 13 points the act of forming or establishing something
- organization 12 letters · 22 points the act of forming or establishing something
- ornamentally 12 letters · 17 points in an ornamental, nonfunctional manner
- ornithomimid 12 letters · 20 points lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large…
- orphenadrine 12 letters · 18 points a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism
- orthodontics 12 letters · 18 points the branch of dentistry dealing with the prevention or correction of irregularities of the teeth
- orthodontist 12 letters · 16 points a dentist specializing in the prevention or correction of irregularities of the teeth
- orthodonture 12 letters · 16 points the branch of dentistry dealing with the prevention or correction of irregularities of the teeth
- orthographic 12 letters · 23 points of or relating to or expressed in orthography
- orthopaedics 12 letters · 20 points the branch of medical science concerned with disorders or deformities of the spine and joints
- orthopaedist 12 letters · 18 points a specialist in correcting deformities of the skeletal system (especially in children)
- orthopedical 12 letters · 20 points of or relating to orthopedics
- orthotropous 12 letters · 17 points (of a plant ovule) completely straight with the micropyle at the apex
- oscillograph 12 letters · 20 points a device for making a record of the wave forms of fluctuating voltages or currents
- oscilloscope 12 letters · 18 points electronic equipment that provides visual images of varying electrical quantities
- osmoreceptor 12 letters · 18 points sensory end organ that responds to changes in osmotic pressure
- ossification 12 letters · 17 points hardened conventionality
- ostentatious 12 letters · 12 points intended to attract notice and impress others
- osteomalacia 12 letters · 16 points abnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin D
- osteopathist 12 letters · 17 points a therapist who manipulates the skeleton and muscles
- osteoporosis 12 letters · 14 points abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common…
- osteosarcoma 12 letters · 16 points malignant bone tumor; most common in children and young adults where it tends to affect the femur
- osteostracan 12 letters · 14 points extinct jawless fish of the Devonian with armored head
- otherworldly 12 letters · 22 points existing outside of or not in accordance with nature
- otosclerosis 12 letters · 14 points hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness
- outlandishly 12 letters · 19 points in an outlandish manner
- outmanoeuvre 12 letters · 17 points defeat by more skillful maneuvering
- outrageously 12 letters · 16 points to an extravagant or immoderate degree
- outstretched 12 letters · 18 points fully extended especially in length
- overabundant 12 letters · 18 points excessively abundant
- overachiever 12 letters · 23 points a student who attains higher standards than the IQ indicated
- overactivity 12 letters · 23 points excessive activity
- overburdened 12 letters · 19 points heavily burdened with work or cares
- overcautious 12 letters · 17 points unnecessarily cautious
- overcritical 12 letters · 19 points inclined to judge too severely
- overcrossing 12 letters · 18 points a bridge designed for pedestrians
- overcrowding 12 letters · 22 points excessive crowding
- overdelicate 12 letters · 18 points extremely delicate
- overemphasis 12 letters · 22 points too much emphasis
- overestimate 12 letters · 17 points a calculation that results in an estimate that is too high
- overexertion 12 letters · 22 points excessive exertion; so much exertion that discomfort or injury results
- overexposure 12 letters · 24 points the act of exposing someone excessively to an influencing experience
- overfamiliar 12 letters · 20 points taking undue liberties
- overgenerous 12 letters · 16 points very generous
- overlordship 12 letters · 21 points the position of overlord
- overmuchness 12 letters · 22 points a quantity that is more than what is appropriate
- overpopulate 12 letters · 19 points cause to have too great a population
- overpowering 12 letters · 21 points so strong as to be irresistible
- overpressure 12 letters · 17 points a transient air pressure greater than the surrounding atmospheric pressure
- overreaching 12 letters · 21 points revealing excessive self-confidence; reaching for the heights
- overreaction 12 letters · 17 points an excessive reaction; a reaction with inappropriate emotional behavior
- oversimplify 12 letters · 25 points simplify to an excessive degree
- overwhelming 12 letters · 24 points very strong; urgently felt