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Index to letter O

-o-

A linking vowel.

-o

Marking informally shortened or slang nouns.

ob-

Towards, to, on, over, or against.

occipito-

The occipital bone.

-ock

Forming nouns.

octo-

Eight; having eight.

oculo-

The eye or the sense of vision.

-ode1

Like; of the nature of.

-ode2

A conductor of electricity.

-odont

Teeth; toothed.

-odontics

Specialisms in dentistry.

odonto-

A tooth or teeth.

-odynia

Pain.

oeno-

Wine.

oesophago-

The oesophagus.

-oic

A carboxyl group or its derivative.

-oid

Like; resembling.

-ol

An alcohol or phenol.

-ola

Diminutives; trade names; humorous or dismissive formations.

-ole1

Organic chemical compounds.

-ole2

Forming nouns.

oleo-

Relating to or containing oil.

oligo-

A small number; having few.

-oma

A tumour or other abnormal growth.

ombro-

Rain; moisture.

-ome

Having a specified nature.

omni-

Of all things; in all places.

omphalo-

The navel; the umbilical cord.

-on1

Subatomic particles or quanta; molecular units.

-on2

Inert gases.

onco-

A tumour.

-one

Various chemical compounds, especially ketones.

oneiro-

Dreams or dreaming.

-onic

Organic acids.

-ont

An individual or cell of a specified type.

onto-

Existence or being.

-onychia

A condition of the nails.

onycho-

The nails.

-onym

A name.

oo-

An egg or ovum.

-oon

Forming nouns and derived verbs.

oophoro-

The ovary.

ophio-

A snake.

ophthalmo-

The eyes.

-opia

A visual disorder.

opistho-

Behind; to the rear.

-opsia

A defect of vision.

-opsis

Observation or perception; likeness.

-opsy

Medical examination.

opto-

Vision; light.

-or1

Someone or something that performs a given action.

-or2

Forming nouns denoting an abstract state or condition.

-orama

A display or spectacle.

orchido-

Testicle; orchid.

organo-

Bodily organs; organic chemical compounds.

-orium

A place for a particular function.

ornitho-

A bird or birds.

oro-1

Mountains.

oro-2

The mouth.

ortho-

Straight; correct; upright.

-ory1

A place having a particular function or character.

-ory2

Relating to or involving an action.

-ose1

Having a specified quality.

-ose2

Sugars and other carbohydrates.

-osis

Abstract nouns of action, state, or process.

-osity

Forming nouns.

-osmia

An abnormal condition of the sense of smell.

osmo-

Osmosis.

osteo-

The bones.

-otic

Forming adjectives and nouns.

oto-

The ears.

-our

Forming nouns.

-ous

Forming adjectives.

out-

Surpassing; external; away from.

ovario-

An ovary.

over-

Excessively; extra; outer; above.

ovi-

Eggs, ova.

oxy-1

Sharp, acid.

oxy-2

Oxygen.

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