English Words: O
15,494 words · Page 300 of 310
A five-membered heterocycle having three carbon atoms, one oxygen atom, one nitrogen atom and two double bonds; the 1,3- isomer is aromatic
Any of a class of heterocyclic ketones, derived from oxazolidine, useful in organic synthesis.
A U-shaped piece of wood used as a collar for an ox, the upper parts of which are fastened to its yoke.
A crescent-shaped lake formed near a flat-valleyed river when one of its meanders becomes pinched off and isolated.
An anticonvulsant and mood-stabilizing drug used primarily in the treatment of epilepsy, a structural derivative of carbamazepine.
A village in Kendal parish, Westmorland and Furness, Cumbria, England, previously in South Lakeland district (OS grid ref SD5389).
University of Oxford, used especially following post-nominal letters indicating status as a graduate.
A United Kingdom-based charity focused on alleviating global poverty and operating a chain of charity shops.
A type of leather shoe with lacing seamlessly integrated into the vamp, giving it a formal appearance.
English spelling as used in Oxford publications, this being mostly the usual British spelling but with the letter z used in the suffixes -ize and -ization.
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 300. 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.