English Words: O
1,431 words · Page 14 of 29
A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and structural genes that are transcribed together.
A medical doctor specializing in the eye: deficiencies of vision requiring correction, and diseases. Compare optometrist.
A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing.
A yellow-brown, addictive narcotic drug obtained from the dried juice of unripe pods of the opium poppy, Papaver somniferum, and containing alkaloids such as morphine, codeine, and papaverine.
One who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.
The practice of taking advantage of any situations or people to achieve an end, often with no regard for principles or consequences.
Someone who takes advantage of any opportunity to advance their own situation, placing expediency above principle.
To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against.
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 14. 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.