English Words: O

15,494 words · Page 35 of 310

octosporoblasticadj

Having eight sporoblasts

octosporousadj

Having eight spores

octostylenoun

A temple or portico with eight columns in front.

octosyllabicadj

Containing eight syllables

octosyllabicaladj

Alternative form of octosyllabic.

octosyllablenoun

line of verse with eight syllables

octothorpenoun

The hash or square symbol #, used mainly in telephony and computing.

octotrigintillionnum

10¹¹⁷.

octovigintillionnum

10⁸⁷.

octovirnoun

Any member of a group of eight officials.

octoviratenoun

A group of eight people, especially (politics) a council of eight men who share office or rule.

octowordnoun

A numerical value of eight times the magnitude of a word, 128 bits on a 16-bit architecture.

octoxidenoun

any oxide having eight oxygen atoms in each molecule or unit cell

octoylnoun

A hypothetical radical, C₈H₁₅O, regarded as the essential residue of octoic acid.

octreenoun

A treelike data structure each of whose nodes has up to eight children, most often used to partition a three-dimensional space by recursively subdividing it.

octreotidenoun

An octapeptide that mimics natural somatostatin pharmacologically, though it is a more potent inhibitor of growth hormone, glucagon and insulin than the natural hormone.

octroinoun

A privilege granted by the sovereign authority, such as the exclusive right of trade granted to a guild or society; a concession.

octroyverb

To grant (a privilege etc, by a government etc).

octuornoun

Synonym of octet (“a composition for eight instruments or voices”).

octupleadj

eightfold

octupletnoun

A group of eight things, particularly

octuplicatenoun

A set of eight like or identical things.

octuplyadv

In an eightfold manner

octupolaradj

Of or pertaining to an octupole.

octylnoun

Any of very many isomeric univalent hydrocarbon radicals, C₈H₁₇, formally derived from octane by the loss of a hydrogen atom

octylaminenoun

Any of very many isomeric amines derived from an octane, but especially the primary amine CH₃(CH₂)₇NH₂

octylenenoun

octene

octylglucosidenoun

A glycoside of glucose and octanol, used as a specialist surfactant

octylicadj

Pertaining to, derived from, or containing octyl.

octylisothiazolinonenoun

A compound used as a preservative.

octyloxynoun

The univalent radical CH₃-(CH₂)₇-O- derived from octanol

octynenoun

Any of many isomeric alkynes having eight carbon atoms and one triple bond

ocularadj

Of, or relating to the eye, or the sense of sight

ocularcentricadj

Centred or focusing on vision.

ocularcentrismnoun

The privileging of vision over the other senses.

ocularistnoun

Someone who specializes in the fabrication and fitting of ocular prostheses for people who have lost an eye or eyes due to trauma or illness.

ocularitynoun

A measure of the number of eyes needed to see something, i.e. monocular or binocular.

oculariumnoun

A slit in a helmet through which the wearer could see.

ocularlyadv

By means of the eye; visually.

ocularyadj

Of or pertaining to the eye.

oculateadj

Having a good sight, sharp-eyed.

oculinoun

plural of oculus

Oculi Sundayname

The third Sunday in Lent.

oculiformadj

Having the shape of an eye

oculistnoun

An eye doctor; an ophthalmologist or optometrist.

oculo-prefix

Of or pertaining to the eye.

oculoauditoryadj

Relating to vision and hearing.

oculoauricularadj

ocular and auricular

oculoauriculovertebraladj

Relating to the eyes, ears, and vertebrae; applied to Goldenhar syndrome.

oculobuccogenitaladj

Relating to the eyes, mouth, and genitals; applied to Behçet's disease.

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 35. 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.