English Words: O
15,494 words · Page 128 of 310
A free-swimming larval stage of some brittle stars, having four pairs of rigid arms lined with cilia.
A zodiacal constellation of the northern summer said to depict a man (Asclepius) holding a serpent; the serpent is the constellation Serpens.
An instrument that is used to measure blood pressure in the blood vessels of the retina
A medical doctor specializing in the eye: deficiencies of vision requiring correction, and diseases. Compare optometrist.
An instrument for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained, un order to assess astigmatism.
A partial or complete paralysis of the extraocular muscles which are responsible for eye movements.
A complete paralysis of the extraocular muscles which are responsible for eye movements.
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 128. 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.