English Words: O
15,494 words · Page 166 of 310
A n-dimensional generalization of the quadrant (in two-dimensional Cartesian space) and octant (in three-dimensional space).
A kind of shallow or "skeletal" soil, found on recent erosional surfaces or very old landforms completely devoid of weatherable minerals.
the member of a series of oxyacids of a particular element that has the highest number of hydroxyl groups
A mixed metal oxide containing one aluminium three oxygen atoms in each formula, MAlO₃
Metamorphic rock composed mostly of amphibole, plagioclase, with lesser amounts of epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite derived from an igneous rock.
A biological material used to improve the healing of broken bones and injured muscles, tendons and ligaments
An orthorhombic-disphenoidal mineral containing hydrogen, oxygen, titanium, and uranium.
A term for a young man, typically a convert or inquirer into Eastern Orthodox Christianity, who engages with the faith primarily online or superficially without deep spiritual integration.
Methyl m-amino-p-hydroxybenzoate, a fine white crystalline powder used as an anesthetic on open wounds.
Any polyether, of general formula C(O-R)₄, formally derived from orthocarbonic acid
One of the centers (UK:centres) of a triangle, defined as being the intersection of its three altitudes; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle; in a right-angled triangle it is the vertex opposite the hypotenuse and so is on the triangle.
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 166. 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.