English Words: O
15,494 words · Page 142 of 310
A musical composition, often based on a religious theme; similar to opera but with no costume, scenery or acting.
The oral equivalent of literature: a collection of traditional folk songs, stories, etc., that is communicated orally rather than in writing.
The process by which a (typically Western) democracy becomes undemocratic as an authoritarian leader takes control of its institutions and degrades the rule of law in order to remain in power.
A group of bioactive cyclic ribosomally synthesized and posttranslationally modified peptides of natural plant sources
The state of being orbate, or deprived of parents or children; privation, in general; bereavement.
A dorsal sclerite over a hymenopteran arolium; a hard exoskeletal feature with species-specific shape that overhangs and protects the adhesive tip of such an insect's leg and around which the claw(s) curl. Abbreviation "or" or "rb".
A muscle of the face that encircles the orbit and passes through the eyelids, serving to close the eye.
A muscle made up of several layers of fibers passing in different directions that surrounds the mouth and controls most movements of the lips (as compressing, closing, or pursing movements).
A topological space in which every small enough neighborhood is homeomorphic to a quotient of real space by the action of a finite group.
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 142. 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.