English Words: O
15,494 words · Page 85 of 310
The twenty-fourth letter of the Classical and the Modern Greek alphabet, and the twenty-eighth letter of the Old and the Ancient Greek alphabet, i.e. the last letter of every Greek alphabet. Uppercase version: Ω; lowercase: ω.
A low-status and subordinate female; a female at the bottom of the social hierarchy.
A maximal level of complexity in the universe, often equated with the Christian God, which some philosophers believe is inevitable.
Any polyunsaturated fatty acid having a double bond between the third and fourth carbon atoms from the end of the molecule farthest from the carboxylic acid; they are found in green vegetables and in the oils of fish such as salmon and mackerel; they are essential fatty acids, and seem to be beneficial in reducing the risk of heart disease.
A variant of soccer (“association football”), played on a round pitch with more than two teams, and associated goals.
The second extended hiatus of Homestuck, lasting from July 28, 2015 to March 28, 2016.
A cup-shaped protrusion from the endoplasmic reticulum that serves as a platform for autophagosome biogenesis in mammalian cells.
In the position known as omega (a transfinite ordinal number referring to the next position after ordering a countably infinite set).
A fictional alternate universe in which humanity has a dominance hierarchy based on stereotypical wolf pack dynamics, consisting of alphas (dominants), omegas (submissives), and betas (neutrals).
An orthorhombic-dipyramidal steel gray mineral containing arsenic, osmium, and ruthenium.
A dish made with beaten eggs cooked in a frying pan without stirring, flipped over to cook on both sides, and sometimes filled or topped with other foodstuffs, for example cheese or chives.
Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury.
An autosomal-recessive severe combined immunodeficiency associated with hypomorphic missense mutations in certain genes.
Any of a family of secretory proteins expressed predominantly in visceral adipose tissue.
The operation of suturing the omentum to the abdominal wall, securing anastomotic communication between the portal system and that of the vena cava.
A substituted benzimidazole (trademark Losec, Prilosec) which is a proton pump inhibitor and inhibits secretion of gastric acid, being given orally in the treatment of ulcers and gastroesophageal reflux; 5-methoxy-2-(4-methoxy-3,5-dimethyl-2-pyridylmethylsulfinyl)benzimidazole, C₁₇H₁₉N₃O₃S.
A code of silence amongst members of the Mafia that forbids divulging insider secrets to law enforcement, often also followed outside of the organization for fear of retaliation.
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 85. 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.