English Words: O
15,494 words · Page 9 of 310
Collectively, the members of a mediaeval Frankish dynasty of Italian nobility comprising Oberto I and descendants; the dynasty itself.
The concept that the most efficient place for spacecraft to change velocity is at the periapsis (the lowest point of an orbit).
Extremely overweight, especially: weighing more than 20% (for men) or 25% (for women) over their conventionally ideal weight determined by height and build; or, having a body mass index over 30 kg/m².
A chemical or other factor that disturbs the body's normal processes, causing it to tend toward obesity.
A small, crescentic fold of white matter that covers the inferior angle of the floor of the fourth ventricle.
The act or process of obfuscating, or obscuring the perception of something; the concept of concealing the meaning of a communication by making it more confusing and harder to interpret.
Having a single series of stamens equal in number to petals, but opposite with them.
The double ship of Hermione Granger/Ron Weasley and Harry Potter/Ginny Weasley from the Harry Potter series.
Leucospora multifida, a small annual plant in the family Plantaginaceae that has pale lavender flowers and grows to around 20 cm (8 in) tall.
A small lamp positioned over the camera, sometimes used to produce catchlights in the subject's eyes.
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 9. 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.