English Words: O

15,494 words · Page 172 of 310

orthoradiallyadv

In an orthoradial manner.

orthorectificationnoun

The processing of an aerial photograph by orthorectifying it.

orthorectifyverb

To process an aerial photograph so as to geometrically correct it such that the scale of the photograph is uniform and it can be measured as a map is.

orthoreovirusnoun

Any virus of the genus Orthoreovirus that infect vertebrates, normally without causing disease

orthoretroviraladj

Relating to orthoretroviruses

orthoretrovirusnoun

Any retrovirus of the subfamily Orthoretrovirinae.

orthorexianoun

A fixation with healthy or righteous eating.

orthorexia nervosanoun

A fixation on righteous eating.

orthorhombicadj

Having three unequal axes at right angles.

orthorhombicaladj

Alternative form of orthorhombic.

orthorhombicallyadv

In an orthorhombic manner

orthorhombicitynoun

The condition of being orthorhombic

orthoroentgenographynoun

orthopedic roentgenography

orthoscopenoun

An instrument for examining the interior of an eye.

orthoscopicadj

free from optical distortion

orthoscopynoun

Examination of the eye by means of the orthoscope.

orthoselectionnoun

The hypothesis that posits that orthogenesis works by means of natural selection.

orthoselectiveadj

regioselective of the ortho- position in a benzene ring

orthoserpieritenoun

An orthorhombic-pyramidal pale blue green mineral containing calcium, copper, hydrogen, oxygen, sulfur, and zinc.

orthosexualadj

Relating to or having the orthodox form of sexuality in a particular culture.

orthosexualitynoun

The orthodox or socially accepted form of sexuality or sexual expression in a particular culture.

orthosianoun

Any moth of the genus Orthosia

Orthosianadj

Of or relating to the god Orthosia in Greek mythology.

orthosilicatenoun

Any salt or ester of orthosilicic acid, (M⁺)₄SiO₄⁴⁻ or Si(OR)₄.

orthosilicicadj

Of, relating to or derived from orthosilicic acid.

orthosiphonnoun

Any herbaceous shrub of the genus Orthosiphon.

orthosisnoun

A type of brace which either prevents or assists movement of a limb or the spine.

orthoslicenoun

A slice that is orthogonal to a particular plane

orthosomaticadj

Having a straight body

orthosomnianoun

An unhealthy obsession with achieving the correct amount and type of sleep.

orthosomycinnoun

Any of a group of antibiotics that have orthoester linkages with a carbohydrate.

orthospermousadj

Having the seeds straight, as in the fruits of some umbelliferous plants.

orthostasisnoun

The act or status of standing upright.

orthostatnoun

An upright stone or slab, especially one which is part of a larger structure.

orthostatenoun

Alternative form of orthostat.

orthostatesnoun

Synonym of orthostat

orthostaticadj

Relating to orthostasis or orthostatism.

orthostereoscopicadj

That produces a three-dimensional image free from distortion

orthostereoscopynoun

The production of a three-dimensional image free from distortion

orthostericadj

Describing the primary, unmodulated binding site (on a receptor) of a ligand

orthostericallyadv

In an orthosteric manner

orthostichousadj

Having orthostichies.

orthostylenoun

A straight line of columns.

orthosubstitutionnoun

Any substitution reaction that introduces an atom or group into the ortho- position

orthosurgeonnoun

An orthopedist or orthopedic surgeon.

orthosurgerynoun

Orthopedics or orthopedic surgery.

orthosymmetricadj

That has equal elements of the secondary diagonal.

orthosympatheticadj

Of or pertaining to the sympathetic component of the autonomic nervous system

orthosymplecticadj

orthogonal and symplectic

orthotacticadj

Relating to orthotactics.

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 172. 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.