English Words: O
15,494 words · Page 104 of 310
A carbazole derivative (trademark Zofran), C₁₈H₁₉N₃O, that is a serotonin receptor antagonist administered by injection and by mouth to relieve nausea and vomiting, especially during cancer therapy.
A medical condition marked by malfunction of the nerves that control involuntary body functions, causing breathing to require conscious effort and therefore meaning patients will die if they fall asleep.
A Korean form of underfloor heating that uses direct heat transfer from wood smoke to the underside of a thick masonry floor.
The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
The entire set of persons or things within a given domain, considered both as separate individuals and collectively.
Used of a reciprocal relationship among a group of two or more people or things; compare each other.
One bad person or element can have a harmful influence on many others.
Extremely quiet, for example, as during a lull in a normally bustling place or scene, or at a sudden dramatic or tense moment.
Policy for the reunification of China as one country, but with areas like Hong Kong and Taiwan with separate economic and political systems.
A style of drumming, prevalent in reggae and attributed to Winston Grennan, in which the snare and bass play on the same beat.
A principle in railway signalling where only one train or locomotive is allowed to run on a section of single-track line, such as a branch line, at any one time.
A trick with one foot free from the bindings; instead it is placed beside the rear binding and boned far away from the board during airtime.
Indicates being on the verge of or in the process of (and sometimes eagerness for) leaving (a place, a relationship, life, etc).
Each individual should act for the benefit of the group, and the group should act for the benefit of each individual.
A countdown prior to exerting some effort, such as launching a burden or running a race.
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 104. 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.