Adjectives Starting with O and Containing TO

This list gathers 110 English adjectives starting with O and containing TO, such as Obligatory, Ontological, Olfactory, Octogenarian, Oratorical, Ovulatory and Oscillatory. Use the sorting controls below to organize entries by length, or consult our adjective grammar guide to check adjective order and comparative rules.

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Starts with OB7 words
obligatory
obbligato
obfuscatory
objurgatory
oblatory
obsignatory
obliquitous
Starts with OC24 words
octogenarian
oculomotor
octoroon
octopod
octosyllabic
octopoid
octoploid
occipitocervical
occipitotemporal
octonary
octosyllable
occipitoposterior
octodecimo
octopodan
octodecillion
octostyle
occipitoparietal
octogenary
occipitoanterior
octopodous
octocentenary
occipitoatlantal
occipitothalamic
octosepalous
Starts with OD12 words
odontoid
odontogenic
odontocete
odontological
odontologic
odontoblastic
odontomatous
odontophoran
odontorhynchous
odontophorous
odontophoral
odontostomatous
Starts with OL
2 words
olfactory
olitory
Starts with OM
1 words
ommatophorous
Starts with ON6 words
onto
ontological
onomatopoeic
ontogenetic
onomatopoetic
ontogenic
Starts with OP7 words
optoelectronic
optometric
optoacoustic
optokinetic
optometrical
opisthotonic
operatorless
Starts with OR12 words
oratorical
orbitofrontal
orthotopic
oratorian
oratorial
orthotonic
orbitosphenoid
orthotone
orbitosphenoidal
orbiculatocordate
ordinatomaculate
orbiculatoelliptical
Starts with OS7 words
oscillatory
osmoregulatory
osculatory
osteosarcomatous
osteochondromatous
osteodermatous
oscillatoriaceous
Starts with OT10 words
ottoman
ototoxic
otologic
otological
otolaryngological
otolithic
otosclerotic
otoscopic
otorhinolaryngologic
otocystic
Starts with OV8 words
ovulatory
oversolicitous
overstored
overcompensatory
oversecretory
ovatocylindraceous
ovatoellipsoidal
ovatoquadrangular
Starts with OX3 words
oxytocic
oxytone
oxytonic

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