English Words: O
15,494 words · Page 13 of 310
Any noun case except the nominative case (and sometimes the vocative case), where the noun is the object of a verb or the object of a preposition.
Synonym of slash ⟨/⟩, sometimes (generally proscribed) inclusive of similar marks such as the backslash ⟨\⟩.
Having pore canals cut diagonally through multiple eggshell units instead of going between them like in other pore systems. Obliquicanaliculate pores are only found in a single oogenus: Preprismatoolithus.
The quality of being oblique in direction, deviating from the horizontal or vertical; or the angle created by such a deviation.
To destroy (someone or something) completely, leaving no trace; to annihilate, to wipe out.
The assimilation of new knowledge that causes changes to one's existing mental framework for organizing that knowledge.
The coloration of an animal that makes it blend into the background; camouflage.
The subsumption of new knowledge that causes older knowledge to be forgotten but leaves the mental framework for both the old and new knowledge to be enhanced.
The state of forgetting completely, of being oblivious, unconscious, unaware, as when sleeping, drunk, or dead.
A person who is completely unaware of their surroundings or actions; an oblivious idiot.
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 13. 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.