English Words: O
15,494 words · Page 169 of 310
A member of the Orthogonian society, a social club at Whittier College founded by Richard M. Nixon in opposition to the wealthy elites at Whittier.
The set of words that can be formed by changing one letter while maintaining letter positions.
A word that differs from another word of the same length by only one letter.
Regarding or relating to orthography (the way in which languages, usually natural languages, are written).
A method of representing a language or the sounds of language by written symbols; spelling.
The normal tendency of a plants parts to bend downward under the effects of gravity
A structure similar to an isogrid but having rectangular rather than triangular openings.
The group of genes descended from a single gene in the last common ancestor of a clade of species.
form of the helium atom in which the spins of the two electrons form a triplet state (a state with definite total spin).
form of the hydrogen molecule (H₂) in which the two nuclei have parallel spin; about 75% of natural hydrogen
The creation of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors.
A form of kinesis in which the speed of movement of the individual is dependent upon the intensity of the stimulus.
Describing any property related to the kinetic energy imparted by collisions with other bodies
Exhibiting orthology; having been separated by a speciation event. Usually while retaining the same function.
Being or having teeth with a nonelongated crown and symmetrical median labial lobe, especially in rodents such as zokors.
The art or practice of constructing verses correctly or harmoniously; the rules of correct poetry.
An orthorhombic-pyramidal mineral containing hydrogen, oxygen, sulfur, and vanadium.
A form of mitosis characterized by an axial, central, symmetric, and bipolar spindle.
Relating to the theory that human health, including mental illness, depends upon chemical deficiencies and can be cured with vitamins etc.
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 169. 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.