oncocytic
Of or pertaining to an oncocyte or to oncocytoma

oncodevelopmental
Relating to the development of a cancer

oncofetal
Typically present only during fetal development, but also found in adults with certain cancers.

oncofoetal
Alternative form of oncofetal.

oncogenetic
Relating to oncogenetics.

oncogenic
Causing the formation of tumors.
Arising from or caused by a tumor: tumor-induced.

oncogenical
Alternative form of oncogenic.

oncogenomic
Relating to oncogenomics or to an oncogenome.

oncogenous
Arising from or caused by a tumor.
Causing a tumor.

oncohaematologic
Alternative form of oncohematological.

oncohaematological
Alternative form of oncohematological.

oncohematologic
Alternative form of oncohematological.

oncohematological
Relating to blood cancer

oncoid
A layered structure formed by cyanobacterial growth and making up part of an oncolite.

oncoids
plural of oncoid

oncoinflammatory
Relating to, or causing oncoinflammation

oncolitic
Containing oncoids or pertaining to oncolite.

oncologic
Of or pertaining to oncology

oncological
Of or pertaining to oncology.

oncolytic
That breaks up cancer cells.

oncolytics
plural of oncolytic

oncometabolic
Relating to oncometabolism or to oncometabolites

oncometric
Relating to oncometry.

oncomiracidial
Relating to the oncomiracidia

oncomodulatory
That modifies the progress of a cancer

onconeural
Relating to cancer and to the neural system.

onconeuronal
Related to cancer and to neurological syndromes

oncoplastic
Describing plastic surgery that mitigates the physical effects of cancer

oncopromoting
That promotes cancer

oncoprotective
That protects against cancer

oncoproteogenomic
Relating to oncoproteogenomes.

oncoproteomic
Relating to oncoproteomes or to oncoproteomics.

oncoretroviral
Of, pertaining to, or caused by an oncoretrovirus.

oncornaviral
Relating to oncornaviruses.

oncospheral
Relating to an oncosphere

oncostatic
That halts the spread of a cancer

oncosuppressive
That suppresses the formation and development of tumours

oncosupressor
Misspelling of oncosuppressor.

oncosurgical
Relating to cancer surgery.

oncotherapeutic
Relating to oncotherapy

oncotic
Relating to osmotic pressure caused by the presence of colloids.

oncotropic
That has an affinity for tumours

oncoviral
Relating to an oncovirus

ondulatory
Misspelling of undulatory.

onefold
Constituting or being indicative of a single aspect or theme.
Consisting of a single undivided part; whole; complete.
Simple, plain, straightforward.
Singular, as opposite to plural.

onehanded
Alternative form of one-handed.

oneiric
Of or pertaining to dreams.
Resembling a dream; dreamlike.

oneirocrit
Synonym of oneirocritic (“an interpreter of dreams”).

oneirocritic
An interpreter of dreams.

oneirocritical
Of or relating to the interpretation of dreams.

oneirocritick
Obsolete form of oneirocritic.

oneirocriticks
plural of oneirocritick

oneirocrits
plural of oneirocrit

oneiroid
Characterized by a dream-like or nightmare-like state, often as part of schizophrenia.

oneirological
Relating to oneirology.

oneiromantic
Of or relating to oneiromancy.

oneirophrenic
Relating to oneirophrenia.

oneiroscopic
Relating to the interpretation of dreams.

oneirotic
Of or relating to oneirosis.

onerary
Fitted for, or carrying, a burden.

onerier
comparative form of onery: more onery

oneriest
superlative form of onery: most onery

onerous
Imposing or constituting a physical, mental, or figurative load which can be borne only with effort; burdensome.

onesided
Alternative spelling of one-sided.

onesied
Wearing a onesie.

oneth
'first', or other ordinal derivatives of 'one', such as hundred-and-oneth or minus-oneth
Used at the end of algebraic expressions indicating ordinal position that end in 1, such as (k+1)ᵗʰ

oneths
plural of oneth

onetime
Alternative form of one-time (“former; past”).
Alternative form of one-time (“occurring once”).

oneway
Alternative form of one-way.

onfield
That takes place on a sports field

onflowing
flowing onward

onglaze
Done on a glazed surface

onhand
Alternative form of on hand.

onioned
Flavoured or made with onion.

onionier
comparative form of oniony: more oniony

onioniest
superlative form of oniony: most oniony

onionized
Flavoured with, or converted into, onion; made oniony.

onionless
Without onions.

onionlike
Resembling or characteristic of an onion, for example in shape, flavour, or layered structure.

oniony
Resembling an onion or onions, especially in terms of smell.
Flavoured with onions.
Resembling or characteristic of the satirical news website The Onion.

oniric
Alternative form of oneiric.

onirocritic
Alternative form of oneirocritic.

onirocritics
plural of onirocritic

onisciform
flattened and broad in form

oniscophagous
Feeding on woodlice.

onland
On the land, as opposed to the ocean.

onlest
Only.

onliest
superlative form of only: most only, used to mean "only" but with added intensiveness or emphasis.

onloan
Alternative form of on-loan.

onlyborn
Born as the only child in a family, flock, or the like.

onlyborns
plural of onlyborn

onocleaceous
Of or relating to the Onocleaceae.

onomantic
Of or relating to onomancy.

onomantical
Alternative form of onomantic

onomasiologic
Alternative form of onomasiological.

onomasiological
Of or pertaining to onomasiology.

onomastic
Of or relating to a personal or place name.
Of or relating to onomastics.

onomatodox
Relating to, supporting or advocating onomatodoxy.

onomatological
Relating to onomatology, the study of the origins of names.

onomatomantic
Of or pertaining to onomatomancy.

onomatopeic
Rare spelling of onomatopoeic.

onomatopoeic
Of or relating to onomatopoeia.
Having the property of onomatopoeia.

onomatopoeical
Alternative form of onomatopoeic.

onomatopoetic
Synonym of onomatopoeic.

onomatopoetical
onomatopoeic

onomatopoietic
Alternative form of onomatopoetic.

onomatopoietical
Alternative form of onomatopoetic.

onomatopoietics
plural of onomatopoietic

onroad
Alternative form of on-road.

onscreen
As seen on a screen (as of television, film, or computer) rather than in real life.

onshell
That conforms to classical physics

onshore
Moving from the sea towards the land.
Positioned on or near the shore.
Within the country; not overseas.

onsite
On or at a site.

onstage
On the part of a stage that is visible to the audience.

onstream
Being produced
available for use

onsweeping
sweeping onward

ontic
Ontological.
Pertaining to being, as opposed to pertaining to a theory of it (which would be ontological).

ontical
Of or relating to ontology.
Pertaining to being generally, as opposed to some theory of it (which would be ontology).

onto
Arriving upon or on top of (speaking of a physical or metaphorical movement).
Aware of.
Being an onto function with a codomain of (see below).

ontoepistemological
Relating to ontoepistemology.

ontogenetic
of or relating to ontogenesis

ontogenetical
ontogenetic

ontogenic
ontogenetic

ontogenical
Alternative form of ontogenic.

ontographic
Relating to ontography.

ontographical
Relating to ontography.

ontologic
ontological

ontological
Of or relating to ontology.
Of or pertaining to the nature of being or existence.

ontologistic
Of or relating to ontologism.

ontonomous
Pertaining to or characteristic of ontonomy; Involving the harmonious coexistence of disparate entities.

ontopragmatic
Relating to ontopragmatics.

ontotheological
Relating to ontotheology.

onward
Moving forward.
Advanced in a forward direction or toward an end.

onwiki
Alternative form of on-wiki.

onwing
On the wing(s) of an aircraft.

onychodystrophic
Relating to onychodystrophy.

onychogryphotic
Related to, or characterised by onychogryphosis.

onychomycotic
Relating to or affected by onychomycosis.

onychopathic
Relating to onychopathy.

onygenaceous
Belonging to the Onygenaceae.

onygenalean
Of or pertaining to the fungal order Onygenales.

onymous
Having a name.