OscaredadjHaving been awarded an Oscar statuette.
oscarellidnounAny of the family Oscarellidae of marine sponges.
OscarlessadjNot winning, or having won, an Oscar (an Academy Award)
OscarlikeadjResembling an Oscar (an Academy Award statue)
OscarworthyadjWorthy of winning an Oscar (an Academy Award).
OsceolanameA community in Admaston/Bromley, Renfrew County, Ontario, Canada.
Osceola CountynameOne of 67 counties in Florida, United States. County seat: Kissimmee.
oschealadjPertaining to the scrotum.
OscinounAn ancient Italic people from Campania in Italy.
oscillateverbTo swing back and forth, especially if with a regular rhythm.
oscillatingadjMoving in a repeated back-and-forth motion; coming and going.
oscillationnounthe act of oscillating or the state of being oscillated
oscillationlikeadjResembling oscillation; moving back and forth, or appearing to do so.
oscillativeadjTending to oscillate; oscillatory, oscillating.
oscillatonnounA spherically-symmetric solution to an Einstein–Klein–Gordon equation
oscillatornounA tuned electronic circuit used to generate a continuous output waveform.
oscillatorioidadjBeing or relating to any cyanobacterium of the order Oscillatoriales.
oscilloclastnounA device that was supposed to diagnose cancer from tissue samples.
oscillogramnounA record produced by an oscillograph or oscilloscope.
oscillographnounAn instrument for measuring alternating or varying electric current in terms of current and voltage; an oscilloscope.
oscillometernounAny of several devices that measure oscillations
oscillopathynounAny neurocognitive disorder characterised by oscillations in brain rhythms
oscillopsianounA visual disturbance in which objects in the visual field appear to oscillate.
oscilloscopenounAn electronic measuring instrument that creates a visible two-dimensional graph, on a screen, of one or more continuously varying voltages or currents.
oscineadjOf or pertaining to songbirds (suborder Passeri).
oscinineadjOf or pertaining to the Oscines, or songbirds (birds of the clade Passeri).
oscitantlyadvIn an oscitant manner; drowsily or yawningly
oscnodenounA node of a plane curve where two branches meet with contact order 3.
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 176. 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.