English Words: O

15,494 words · Page 303 of 310

oxocyclohexylnoun

A univalent radical derived from cyclohexanone

oxodegradableadj

That degrades in the presence of oxygen.

oxodicarboxylatenoun

Any derivative of a dicarboxylate in which a methylene group has been replaced by a carbonyl group

oxodicarboxylicadj

Relating to a dicarboxylic acid in which a methylene group has been replaced by a carbonyl group

oxoerythromycinnoun

A ketone derived from erythromycin

Any radical formed by substitution of an oxygen atom (as a carbonyl group) for two hydrogen atoms of an ethyl radical

oxofluoridenoun

Any oxohalide in which the halide is fluoride

oxoglutaratenoun

Any salt or ester of oxoglutaric acid.

An oxidized form of guanine typically formed by ionizing radiation

Any of several anions or complexes that contain both an oxide and a halide group

oxohydroxidenoun

Alternative form of oxyhydroxide.

oxoindolizidinenoun

Any derivative of indolizidine in which a methylene group has been replaced by a carbonyl group

Any oxohalide in which the halide is iodide

Synonym of oxoanion.

oxoisoaporphinenoun

Any oxo derivative of an isoaporphine

oxoluminescencenoun

luminescence when in the presence of oxygen

oxoluminescentadj

luminescent when in the presence of oxygen

oxomaritidinenoun

An alkaloid (1S,10R)-4,5-dimethoxy-9-azatetracyclo[7.5.2.01,10.02,7]hexadeca-2,4,6,13-tetraen-12-one

oxomemazinenoun

A particular antihistamine drug.

oxometalatenoun

Alternative spelling of oxometallate.

oxometallatenoun

Any metallate containing oxygen as ligand

Oxonname

Postal abbreviation for Oxfordshire.

A salt of oxonic acid.

Of or pertaining to Oxford or to the University of Oxford.

Any univalent oxygen cation derived from water, the simplest of which is the hydronium ion (H₃O⁺).

oxononanoatenoun

Any salt or ester of the keto acid derived from nonanoic acid, some of which have biochemical functions

oxopentanoatenoun

Any derivative of a pentanoate in which a methylene group is replaced by a carbonyl group; a salt or ester of an oxopentanoic acid

Exhibiting oxophilicity

oxophilicitynoun

A tendency to form oxides, typically by abstraction of oxygen from organic compounds.

oxophytodienoatenoun

Any salt or ester of oxophytodienoic acid; they are jasmonate phytohormones.

oxopiperazinenoun

A heterocyclic ketone formed by replacing a methylene group of piperazine with a carbonyl group

oxopropanoatenoun

A salt or ester of oxopropanoic acid.

oxopropanoicadj

Of or relating to a compound containing a ketone group attached to a three-carbon chain with a carboxylic acid functional group.

A rhenium and oxygen atom bound together as part of a larger ion or complex

Synonym of ketosteroid.

oxothiazolidinenoun

Alternative form of oxathiazolidine.

A type of cell that has a particular oxygen uptake rate

oxovanadatenoun

Any of several vanadate derivatives that have an extra oxygen atom

oxovanadiumnoun

The cation VO²⁺

Either of two species of passerine bird in the genus Buphagus, endemic to the sub-Saharan African savanna.

oxpheneridinenoun

A 4-phenylpiperidine derivative related to the opioid analgesic drug pethidine.

A shoe for oxen, consisting of a flat piece of iron that is nailed to the hoof.

The hide of an ox.

The tail of an ox or cow.

A team of oxen.

A town and civil parish in and the administrative centre of Tandridge district, Surrey, England (OS grid ref TQ3952).

The armpit.

To carry (a person) by supporting them under the armpits

Beef tongue (a foodstuff).

Oxusname

The Amu Darya river.

Spelling & Dictionary Insight

The English alphabetical index for the letter O contains 15,494 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 310 pages, and you are currently viewing page 303. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.