Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English

Index of letter O

-oMarking informally shortened or slang nouns.
-o-A linking vowel.
o-1See ob-
o-2See ortho-
oario-See ovario-
ob-Towards, to, on, over, or against.
occipito-The occipital bone.
-ockForming nouns.
-ocracySee -cracy
octo-Eight; having eight.
oculo-The eye or the sense of vision.
-ode1Like; of the nature of.
-ode2A conductor of electricity.
-odontTeeth; toothed.
-odonticsSpecialisms in dentistry.
odont(o)-A tooth or teeth.
-odyniaPain.
oen(o)-Wine.
oesophag(o)-The oesophagus.
of-See ob-
-ogenSee -gen
-ographySee -graphy
-oholicSee -aholic
-oicA carboxyl group or its derivative.
-oidLike; resembling.
-oidesSee -ides
-olAn alcohol or phenol.
-olaDiminutives; trade names; humorous or dismissive formations.
-olatrySee -latry
-ole1Organic chemical compounds.
-ole2Forming nouns.
ole(o)-Relating to or containing oil.
-olidineSee -idine
olig(o)-A small number; having few.
-ologicalSee -logical
-ologistSee -logist
-ologySee -logy
-omaA tumour or other abnormal growth.
ombro-Rain; moisture.
-omeHaving a specified nature.
-ometerSee -meter
-ometrySee -metric
omni-Of all things; in all places.
omphal(o)-The navel; the umbilical cord.
-on1Subatomic particles or quanta; molecular units.
-on2Inert gases.
onco-A tumour.
-oneVarious chemical compounds, especially ketones.
oneir(o)-Dreams or dreaming.
-onicOrganic acids.
-ontAn individual or cell of a specified type.
onto-Existence or being.
-onychiaA condition of the nails.
onycho-The nails.
-onymA name.
oo-An egg or ovum.
-oonForming nouns and derived verbs.
oophor(o)-The ovary.
op-See ob-
-opediaSee -pedia
ophi(o)-A snake.
ophthalm(o)-The eyes.
-opiaA visual disorder.
opistho-Behind; to the rear.
-opsiaA defect of vision.
-opsisObservation or perception; likeness.
-opsyMedical examination.
opto-Vision; light.
-or1Someone or something that performs a given action.
-or2Forming nouns denoting an abstract state or condition.
-or3See -ior
-oramaA display or spectacle.
orchid(o)-Testicle; orchid.
organo-Bodily organs; organic chemical compounds.
-orialSee -al1
-oriumA place for a particular function.
ornith(o)-A bird or birds.
oro-1Mountains.
oro-2The mouth.
ortho-Straight; correct; upright.
-ory1A place having a particular function or character.
-ory2Relating to or involving an action.
os-See ob-
-oscopeSee -scope
-ose1Having a specified quality.
-ose2Sugars and other carbohydrates.
-osisAbstract nouns of action, state, or process.
-osityForming nouns.
-osmiaAn abnormal condition of the sense of smell.
osmo-Osmosis.
oste(o)-The bones.
-ostomySee -stomy
-oticForming adjectives and nouns.
oto-The ears.
-otomySee -tomy
-ourForming nouns.
-ousForming adjectives.
out-Surpassing; external; away from.
ovari(o)-An ovary.
over-Excessively; extra; outer; above.
ovi-Eggs, ova.
oxa-See oxy-2
oxy-1Sharp, acid.
ox(y)-2Oxygen.
-oylSee -yl
-ozoaSee -zoon

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