English Words: O
15,494 words · Page 138 of 310
A person trained and skilled in examining and testing the eyes for defects, in order to prescribe corrective lenses or treatment.
Describing movement of the eye, head or body (especially of insects) that steadies the field of vision
Belonging to the family Opuntiaceae (now mostly subfamily Opuntioideae in Cactaceae).
A work of music or set of works with a specified rank in an ordering of a composer's complete published works.
The Prelature of the Holy Cross and Opus Dei, a Roman Catholic organization composed of a prelate, secular clergy and lay people, whose mission is to spread the Catholic teaching that everyone is called to become a saint; its lay members, men and women, engage in the affairs of the world and seek to direct them "according to God's will".
An Ancient Roman construction technique, using irregular-shaped and randomly placed uncut stones or fist-sized tuff blocks inserted in a core of opus caementicium (Roman concrete).
The spiritual effect in the performance of a religious rite that is ascribed chiefly or exclusively to the disposition of the recipient.
The spiritual effect in the performance of a religious rite which accrues from the virtue inherent in it, or by grace imparted to it, irrespective of the performer.
An ancient Roman construction technique in which squared blocks of stone of the same height were set in parallel courses, most often without the use of mortar.
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 138. 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.