English Words: O
15,494 words · Page 178 of 310
Initialism of Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer, a NASA asteroid-study and sample-return mission.
A surname from Icelandic. (this is not a surname in Icelandic, it is merely a patronym in Iceland; it is adopted as a surname into English)
A river in Russia and Ukraine which arises roughly between Kursk and Voronezh and flows south to join the Seversky Donets.
A rare autosomal-dominant hereditary disorder involving osteosarcoma, limb anomalies, and erythroid macrocytosis with megaloblastic marrow.
A painful, red, raised skin lesion, usually on the pads of the fingers or toes, indicative of the heart disease bacterial endocarditis.
Of or relating to William Osler (1849–1919), Canadian physician regarded as the father of modern medicine.
The process of Oslerizing; euthanasia given to a person as a consequence of their having reached old age.
A county and municipality, the capital city of Norway. Formerly called Christiania and Kristiania.
A healthy breakfast served to schoolchildren, typically including wholemeal bread, cheese, milk, and fruit.
Thicker rough-textured bond paper (usually sized 9 inches by 12 inches or 229mm by 305mm).
A Chinese distilled spirit flavored with osmanthus flowers, specially consumed during the Mid-Autumn Festival.
A substance formerly supposed to impart the characteristic meaty smell and taste to certain dishes.
A nitrogenous acid of osmium, H₂N₂Os₂O₅, forming osmiomates (a series of yellow salts).
Pertaining to, derived from, or containing, osmium; specifically, designating those compounds in which it has a higher valence.
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 178. 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.