English Words: O
15,494 words · Page 154 of 310
The polymerization of organic compounds, especially when catalysed by another organic compound.
protection from the action of organic compounds, especially from organic free radicals
That provides protection from the action of organic compounds, especially from organic free radicals
describing any of a series of derivatives of selenium that have at least one alkyl or aryl group, especially one containing at least one carbon-selenium bond
Describing any of a series of derivatives of silicon that have at least one alkyl or aryl group, especially one containing at least one carbon–silicon bond.
Relating to a body organ and the rest of the body, but especially to the ratio of their weights
Also referred to as thioethers, a class of organic compounds RSR', where R and R' represent an alkyl group or other organic substituent. If R' is hydrogen, it is instead referred to as a thiol, or mercaptan.
Describing any of a series of derivatives of sulfur that have at least one alkyl or aryl group, especially one containing at least one carbon-sulfur bond.
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 154. 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.