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1593 Words That Start With O

Part of Speech:
Word Definitions Synonyms
o (noun) the 15th letter of the Roman alphabet Synonyms: O
oaf (noun) an awkward stupid person Synonyms: clod, gawk, goon, lout, lubber, lummox, lump, stumblebum
oafish (adjective) ill-mannered and coarse and contemptible in behavior or appearance Synonyms: boorish, loutish, neandertal, neanderthal, swinish
oak (noun) a deciduous tree of the genus Quercus; has acorns and lobed leaves Synonyms: oak tree
(noun) the hard durable wood of any oak; used especially for furniture and flooring
oaken (adjective) consisting of or made of wood of the oak tree
oakum (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships
oar (noun) an implement used to propel or steer a boat
oarfish (noun) thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin Synonyms: king of the herring, Regalecus glesne, ribbonfish
oarlock (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing Synonyms: peg, pin, rowlock, thole, tholepin
oarsman (noun) a male who rows a boat
oarsmanship (noun) skill as an oarsman
oarswoman (noun) a woman oarsman
oasis (noun) a shelter serving as a place of safety or sanctuary Synonyms: haven
(noun) a fertile tract in a desert (where the water table approaches the surface)
oast (noun) a kiln for drying hops
oat (noun) seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')
(noun) annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
oatcake (noun) thin flat unleavened cake of baked oatmeal
oaten (adjective) of or related to or derived from oats
oath (noun) a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury Synonyms: swearing
(noun) profane or obscene expression usually of surprise or anger Synonyms: curse, curse word, cuss, expletive, swearing, swearword
(noun) a solemn promise, usually invoking a divine witness, regarding your future acts or behavior
oatmeal (noun) porridge made of rolled oats Synonyms: burgoo
(noun) meal made from rolled or ground oats Synonyms: rolled oats
obbligato (noun) a part of the score that must be performed without change or omission Synonyms: obligato
(noun) a persistent but subordinate motif Synonyms: obligato
obduracy (noun) resoluteness by virtue of being unyielding and inflexible Synonyms: adamance, unyieldingness
obdurate (adjective) showing unfeeling resistance to tender feelings Synonyms: flint, flinty, granitic, stony
(adjective) stubbornly persistent in wrongdoing Synonyms: cussed, obstinate, unrepentant
obdurately (adverb) in a stubborn unregenerate manner Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly
obeah (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas Synonyms: obi
(noun) (West Indies) followers of a religious system involving witchcraft and sorcery Synonyms: obi
obeche (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood Synonyms: arere, obechi, samba, Triplochiton scleroxcylon
(noun) the wood of an African obeche tree; used especially for veneering
obechi (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood Synonyms: arere, obeche, samba, Triplochiton scleroxcylon
obedience (noun) the act of obeying; dutiful or submissive behavior with respect to another person Synonyms: obeisance
(noun) behavior intended to please your parents Synonyms: respect
(noun) the trait of being willing to obey
obedient (adjective) dutifully complying with the commands or instructions of those in authority
obediently (adverb) in an obedient manner Synonyms: yieldingly
obeisance (noun) the act of obeying; dutiful or submissive behavior with respect to another person Synonyms: obedience
(noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting Synonyms: bow, bowing
obelion (noun) the craniometric point on the sagittal suture near the lamboid suture
obelisk (noun) a stone pillar having a rectangular cross section tapering towards a pyramidal top
(noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used Synonyms: dagger
obese (adjective) excessively fat Synonyms: corpulent, rotund, weighty
obesity (noun) more than average fatness Synonyms: corpulency, fleshiness
obey (verb) be obedient to
obfuscate (verb) make obscure or unclear
obfuscation (noun) the activity of obscuring people's understanding, leaving them baffled or bewildered Synonyms: mystification
(noun) darkening or obscuring the sight of something
(noun) confusion resulting from failure to understand Synonyms: bafflement, befuddlement, bemusement, bewilderment, mystification, puzzlement
obi (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas Synonyms: obeah
(noun) (West Indies) followers of a religious system involving witchcraft and sorcery Synonyms: obeah
obiism (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies
obit (noun) a notice of someone's death; usually includes a short biography Synonyms: necrology, obituary
obituary (noun) a notice of someone's death; usually includes a short biography Synonyms: necrology, obit
object (noun) a tangible and visible entity; an entity that can cast a shadow Synonyms: physical object
(noun) the goal intended to be attained (and which is believed to be attainable) Synonyms: aim, objective, target
(noun) the focus of cognitions or feelings
(noun) (computing) a discrete item that provides a description of virtually anything known to a computer
(noun) (grammar) a constituent that is acted upon
(verb) express or raise an objection or protest or criticism or express dissent
(verb) be averse to or express disapproval of
objectification (noun) the act of representing an abstraction as a physical thing
(noun) a concrete representation of an abstract idea or principle
objectify (verb) make impersonal or present as an object Synonyms: depersonalise, depersonalize
(verb) make external or objective, or give reality to Synonyms: exteriorise, exteriorize, externalise, externalize
objection (noun) (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality
(noun) the act of protesting; a public (often organized) manifestation of dissent Synonyms: dissent, protest
(noun) the speech act of objecting
(noun) the act of expressing earnest opposition or protest Synonyms: expostulation, remonstrance, remonstration
objectionable (adjective) causing disapproval or protest Synonyms: obnoxious
(adjective) liable to objection or debate; used of something one might take exception to Synonyms: exceptionable
objectionableness (noun) the quality of being hateful Synonyms: hatefulness, obnoxiousness
objectionably (adverb) in an obnoxious manner Synonyms: obnoxiously, offensively
objective (adjective) undistorted by emotion or personal bias; based on observable phenomena Synonyms: nonsubjective
(adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes Synonyms: accusative
(adjective) belonging to immediate experience of actual things or events
(adjective) emphasizing or expressing things as perceived without distortion of personal feelings or interpretation
(noun) the lens or system of lenses in a telescope or microscope that is nearest the object being viewed Synonyms: object glass, object lens, objective lens
(noun) the goal intended to be attained (and which is believed to be attainable) Synonyms: aim, object, target
objectively (adverb) with objectivity
objectiveness (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices Synonyms: objectivity
objectivity (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices Synonyms: objectiveness
objectivization (noun) the act or process of making or becoming objective.
objector (noun) a person who dissents from some established policy Synonyms: contestant, dissenter, dissident, protester
objurgate (verb) express strong disapproval of Synonyms: condemn, decry, excoriate, reprobate
(verb) censure severely Synonyms: castigate, chasten, chastise, correct
objurgation (noun) rebuking a person harshly Synonyms: chiding, scolding, tongue-lashing
oblanceolate (adjective) (of a leaf shape) having a broad rounded apex and a tapering base
oblate (adjective) having the equatorial diameter greater than the polar diameter; being flattened at the poles Synonyms: pumpkin-shaped
(noun) a lay person dedicated to religious work or the religious life
oblateness (noun) the property possessed by a round shape that is flattened at the poles Synonyms: ellipticity
oblation (noun) the act of contributing to the funds of a church or charity Synonyms: offering
obligate (adjective) restricted to a particular condition of life
(verb) bind by an obligation; cause to be indebted Synonyms: bind, hold, oblige
(verb) commit in order to fulfill an obligation
(verb) force somebody to do something Synonyms: compel, oblige
obligated (adjective) caused by law or conscience to follow a certain course
obligation (noun) the social force that binds you to the courses of action demanded by that force Synonyms: duty, responsibility
(noun) a legal agreement specifying a payment or action and the penalty for failure to comply
(noun) a written promise to repay a debt Synonyms: certificate of indebtedness, debt instrument
(noun) a personal relation in which one is indebted for a service or favor Synonyms: indebtedness
(noun) the state of being obligated to do or pay something
obligational (adjective) relating or constituting or qualified to create a legal or financial obligation
obligato (noun) a part of the score that must be performed without change or omission Synonyms: obbligato
(noun) a persistent but subordinate motif Synonyms: obbligato
obligatorily (adverb) in a manner that cannot be evaded Synonyms: compulsorily, mandatorily
(adverb) in an obligatory manner
obligatory (adjective) morally or legally constraining or binding
(adjective) required by obligation or compulsion or convention
oblige (verb) bind by an obligation; cause to be indebted Synonyms: bind, hold, obligate
(verb) provide a service or favor for someone Synonyms: accommodate
(verb) force somebody to do something Synonyms: compel, obligate
obliged (adjective) under a moral obligation to do something Synonyms: duty-bound
obliger (noun) someone who performs a service or does a favor Synonyms: accommodator
obliging (adjective) showing a cheerful willingness to do favors for others Synonyms: complaisant
obligingly (adverb) in accommodation Synonyms: accommodatingly
obligingness (noun) a disposition or tendency to yield to the will of others Synonyms: complaisance, compliance, compliancy, deference
oblique (adjective) slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
(adjective) indirect in departing from the accepted or proper way; misleading Synonyms: devious
(noun) a diagonally arranged abdominal muscle on either side of the torso Synonyms: abdominal external oblique muscle, external oblique muscle, musculus obliquus externus abdominis
(noun) any grammatical case other than the nominative Synonyms: oblique case
obliquely (adverb) at an oblique angle Synonyms: aslant, athwart
(adverb) to, toward or at one side Synonyms: sidelong, sideways
obliqueness (noun) the property of being neither parallel nor perpendicular, but at a slanting angle
(noun) the quality of being oblique and rambling indirectly Synonyms: deviousness
obliquity (noun) the quality of being deceptive Synonyms: deceptiveness
(noun) the presentation during labor of the head of the fetus at an abnormal angle Synonyms: asynclitism
obliterable (adjective) able to be obliterated completely Synonyms: removable
obliterate (adjective) reduced to nothingness Synonyms: blotted out, obliterated
(verb) remove completely from recognition or memory Synonyms: efface
(verb) make undecipherable or imperceptible by obscuring or concealing Synonyms: blot out, hide, obscure, veil
(verb) mark for deletion, rub off, or erase Synonyms: kill, wipe out
(verb) do away with completely, without leaving a trace
obliterated (adjective) reduced to nothingness Synonyms: blotted out, obliterate
obliteration (noun) destruction by annihilating something Synonyms: annihilation
(noun) the complete destruction of every trace of something Synonyms: eradication
obliterator (noun) an eliminator that does away with all traces
oblivion (noun) total forgetfulness Synonyms: obliviousness
(noun) the state of being disregarded or forgotten Synonyms: limbo
oblivious (adjective) failing to keep in mind Synonyms: forgetful
(adjective) (followed by `to' or `of') lacking conscious awareness of Synonyms: unmindful
obliviousness (noun) total forgetfulness Synonyms: oblivion
oblong (adjective) deviating from a square or circle or sphere by being elongated in one direction
(adjective) (of a leaf shape) having a somewhat elongated form with approximately parallel sides
(noun) a plane figure that deviates from a square or circle due to elongation
oblongness (noun) the property of being shaped like a rectangle Synonyms: rectangularity
obloquy (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions Synonyms: calumniation, calumny, defamation, hatchet job, traducement
(noun) state of disgrace resulting from public abuse Synonyms: opprobrium
obnoxious (adjective) causing disapproval or protest Synonyms: objectionable
obnoxiously (adverb) in an obnoxious manner Synonyms: objectionably, offensively
obnoxiousness (noun) the quality of being hateful Synonyms: hatefulness, objectionableness
obnubilate (verb) make unclear, indistinct, or blurred Synonyms: blur, confuse, obscure
(verb) make less visible or unclear Synonyms: becloud, befog, cloud, fog, haze over, mist, obscure
oboe (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece Synonyms: hautbois, hautboy
oboist (noun) a musician who plays the oboe
obolus (noun) a Greek unit of weight equal to one tenth of a gram
obovate (adjective) (of a leaf shape) egg-shaped with the narrower end at the base
obscene (adjective) suggestive of or tending to moral looseness Synonyms: lewd, raunchy, salacious
(adjective) designed to incite to indecency or lust
(adjective) offensive to the mind Synonyms: abhorrent, detestable, repugnant, repulsive
obscenely (adverb) in a lewd and obscene manner Synonyms: lewdly
(adverb) to an obscene degree
obscenity (noun) an obscene act
(noun) the trait of behaving in an obscene manner Synonyms: bawdiness, lewdness, salaciousness, salacity
(noun) an offensive or indecent word or phrase Synonyms: dirty word, filth, smut, vulgarism
obscurantism (noun) a deliberate act intended to make something obscure
(noun) a policy of opposition to enlightenment or the spread of knowledge

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