English Words: O
15,494 words · Page 304 of 310
A type of torch in which the oxygen and the hydrogen are led off the electrolysis cell separately and are fed into the two gas connections.
A mixture of oxygen and acetylene, which burns at a high temperature and is used for cutting and welding metals.
Any addition reaction in which an oxygen atom and an aryl group are added across a double bond or triple bond
An antispasmodic and anticholinergic drug C₂₂H₃₁NO₃ administered transdermally as a skin patch or orally in the form of its hydrochloride C₂₂H₃₁NO₃·HCl to relax the smooth muscles of the bladder in the treatment of urge incontinence, frequent urination, and urinary urgency.
The monitoring of the concentration of oxygen and carbon dioxide in the respiratory gases, generally during anesthesia or intensive care
A kind of cephalic disorder: sometimes the premature closure of the coronal suture plus any other suture, such as the lambdoid; sometimes the premature fusing of all sutures.
A salicylanilide anthelmintic used in the treatment and control of Fascioliasis in ruminants.
An addictive, semisynthetic opioid (trademark OxyContin) that is similar to morphine in effect and structure; C₁₈H₂₁NO₄.
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 304. 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.