English Words: O
1,431 words · Page 10 of 29
Nerium oleander, a notoriously poisonous shrub in the dogbane family, Apocynaceae, but nonetheless widely grown as an ornamental, having leathery lance-shaped leaves and deep rose-colored or white flowers.
Any of a class of unsaturated open-chain hydrocarbons such as ethylene; an alkene with only one carbon-carbon double bond.
A type of energy-absorbing landing gear strut in which sudden compression or extension of the strut causes a gas-filled chamber to push or pull a piston which forces oil through a small orifice, resulting in absorption of energy through viscous effects.
The ship of characters Oliver Queen (Green Arrow) and Felicity Smoak from the television series Arrow.
A government run by and for only a few, often the aristocracy, the wealthy, or their friends and associates.
Of a geologic epoch within the Paleogene period from about 34 to 23 million years ago; marked by the rapid evolution in a warm climate.
A short sequence of nucleotides (RNA or DNA), typically with twenty or fewer base pairs.
An economic condition in which a small number of sellers exert control over the market of a commodity.
A tree of species Olea europaea cultivated since ancient times in the Mediterranean for its fruit and the oil obtained from it.
Any of a group of olive green magnesium-iron silicate minerals that crystallize in the orthorhombic system.
An aerial maneuver in which one catches air by leaping off the ground with the skateboard and into the air.
A member of an ancient pre-Columbian people living in the tropical lowlands of south-central Mexico, in what are roughly the modern-day states of Veracruz and Tabasco.
Of or relating to Mount Olympus, the highest mountain in Greece; or (Greek mythology) the Greek gods and goddesses who were believed to live there.
A member of a tribe of Native Americans currently residing in northeastern Nebraska and western Iowa.
Spelling & Dictionary Insight
The English alphabetical index for the letter O contains 1,431 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 29 pages, and you are currently viewing page 10. 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.