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140 Words That Start With OP

Part of Speech:
Word Definitions Synonyms
opacification (noun) the process of becoming cloudy or opaque
opacify (verb) become opaque
(verb) make opaque
opacity (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light Synonyms: opaqueness
(noun) incomprehensibility resulting from obscurity of meaning Synonyms: opaqueness
(noun) the phenomenon of not permitting the passage of electromagnetic radiation
opah (noun) large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean Synonyms: Lampris regius, moonfish
opal (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
opalesce (verb) exhibit a play of colors like that of an opal
(verb) reflect light or colors like an opal
opalescence (noun) the visual property of something having a milky brightness and a play of colors from the surface Synonyms: iridescence
opalescent (adjective) having a play of lustrous rainbow colors Synonyms: iridescent, nacreous, opaline, pearlescent
opaline (adjective) having a play of lustrous rainbow colors Synonyms: iridescent, nacreous, opalescent, pearlescent
opalise (verb) replace or convert into opal Synonyms: opalize
(verb) make opalescent Synonyms: opalize
opalize (verb) replace or convert into opal Synonyms: opalise
(verb) make opalescent Synonyms: opalise
opaque (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight
(adjective) hard or impossible to understand Synonyms: unintelligible
opaquely (adverb) in an opaque manner
opaqueness (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light Synonyms: opacity
(noun) incomprehensibility resulting from obscurity of meaning Synonyms: opacity
open (adjective) ready or willing to receive favorably Synonyms: receptive
(adjective) affording unobstructed entrance and exit; not shut or closed Synonyms: unfastened
(adjective) affording free passage or access
(adjective) (set theory) of an interval that contains neither of its endpoints
(adjective) open and observable; not secret or hidden Synonyms: overt
(adjective) used of mouth or eyes Synonyms: opened
(adjective) ready for business
(adjective) not having been filled
(adjective) (of textures) full of small openings or gaps Synonyms: loose
(adjective) openly straightforward and direct without reserve or secretiveness Synonyms: candid, heart-to-heart
(adjective) not requiring union membership
(adjective) open to or in view of all
(adjective) possibly accepting or permitting Synonyms: capable, subject
(adjective) without undue constriction as from e.g. tenseness or inhibition
(adjective) having no protecting cover or enclosure
(adjective) affording free passage or view Synonyms: clear
(adjective) with no protection or shield Synonyms: exposed
(adjective) accessible to all
(adjective) not sealed or having been unsealed Synonyms: opened
(adjective) not brought to a conclusion; subject to further thought Synonyms: undecided, undetermined, unresolved
(adjective) not defended or capable of being defended Synonyms: assailable, undefendable, undefended
(noun) information that has become public Synonyms: surface
(noun) a tournament in which both professionals and amateurs may play
(noun) a clear or unobstructed space or expanse of land or water Synonyms: clear
(noun) where the air is unconfined Synonyms: open air, out-of-doors, outdoors
(verb) make available Synonyms: open up
(verb) become available Synonyms: open up
(verb) make the opening move
(verb) cause to open or to become open Synonyms: open up
(verb) become open Synonyms: open up
(verb) spread out or open from a closed or folded state Synonyms: spread, spread out, unfold
(verb) display the contents of a file or start an application as on a computer
(verb) afford access to Synonyms: afford, give
(verb) start to operate or function or cause to start operating or functioning Synonyms: open up
(verb) begin or set in action, of meetings, speeches, recitals, etc.
(verb) have an opening or passage or outlet
openbill (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip
opencast (adjective) (of mines and mining) worked from the exposed surface Synonyms: opencut
opencut (adjective) (of mines and mining) worked from the exposed surface Synonyms: opencast
opened (adjective) used of mouth or eyes Synonyms: open
(adjective) made open or clear
(adjective) not sealed or having been unsealed Synonyms: open
opener (noun) a hand tool used for opening sealed containers (bottles or cans)
(noun) the first event in a series
(noun) a person who unfastens or unwraps or opens Synonyms: undoer, unfastener, untier
openhanded (adjective) given or giving freely Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal
openhandedness (noun) liberality in bestowing gifts; extremely liberal and generous of spirit Synonyms: largess, largesse, magnanimity, munificence
openhearted (adjective) freely communicative; candidly straightforward
(adjective) showing or motivated by sympathy and understanding and generosity Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic
opening (adjective) first or beginning
(noun) a recognized sequence of moves at the beginning of a game of chess Synonyms: chess opening
(noun) the act of opening something
(noun) becoming open or being made open
(noun) the first of a series of actions Synonyms: first step, initiative, opening move
(noun) a vacant or unobstructed space that is man-made
(noun) an entrance equipped with a hatch; especially a passageway between decks of a ship Synonyms: hatchway, scuttle
(noun) an aperture or hole that opens into a bodily cavity Synonyms: orifice, porta
(noun) a possible alternative Synonyms: possibility, possible action
(noun) the initial part of the introduction
(noun) the first performance (as of a theatrical production) Synonyms: curtain raising, opening night
(noun) a ceremony accompanying the start of some enterprise
(noun) an open or empty space in or between things Synonyms: gap
(noun) opportunity especially for employment or promotion
openly (adverb) in an open way
openmouthed (adjective) with eyes or mouth open in surprise Synonyms: goggle-eyed, popeyed
openness (noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive Synonyms: nakedness
(noun) willingness or readiness to receive (especially impressions or ideas) Synonyms: receptiveness, receptivity
(noun) without obstructions to passage or view
openwork (noun) ornamental work (such as embroidery or latticework) having a pattern of openings
opepe (noun) large African forest tree yielding a strong hard yellow to golden brown lumber; sometimes placed in genus Sarcocephalus Synonyms: Nauclea diderrichii, Sarcocephalus diderrichii
opera (noun) a building where musical dramas are performed Synonyms: opera house
(noun) a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes
operable (adjective) capable of being treated by surgical operation
(adjective) usable for a specific purpose Synonyms: practicable
(adjective) fit or ready for use or service Synonyms: functional, operational, usable, useable
operagoer (noun) a patron of the opera
operand (noun) a quantity upon which a mathematical operation is performed
operant (adjective) having influence or producing an effect
operate (verb) perform surgery on Synonyms: operate on
(verb) perform a movement in military or naval tactics in order to secure an advantage in attack or defense Synonyms: maneuver, manoeuver, manoeuvre
(verb) handle and cause to function Synonyms: control
(verb) keep engaged Synonyms: engage, lock, mesh
(verb) perform as expected when applied Synonyms: function, go, run, work
(verb) direct or control; projects, businesses, etc. Synonyms: run
operatic (adjective) of or relating to or characteristic of opera
operating (adjective) involved in a kind of operation
(adjective) being in effect or operation Synonyms: in operation, operational
operation (noun) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body Synonyms: surgery, surgical operation, surgical procedure, surgical process
(noun) (mathematics) calculation by mathematical methods Synonyms: mathematical operation, mathematical process
(noun) activity by a military or naval force (as a maneuver or campaign) Synonyms: military operation
(noun) a planned activity involving many people performing various actions
(noun) a process or series of acts especially of a practical or mechanical nature involved in a particular form of work Synonyms: procedure
(noun) a business especially one run on a large scale
(noun) the activity of operating something (a machine or business etc.)
(noun) (psychology) the performance of some composite cognitive activity; an operation that affects mental contents Synonyms: cognitive operation, cognitive process, mental process, process
(noun) (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)
(noun) process or manner of functioning or operating Synonyms: functioning, performance
(noun) the state of being in effect or being operative
operational (adjective) (military) of or intended for or involved in military operations
(adjective) pertaining to a process or series of actions for achieving a result
(adjective) being in effect or operation Synonyms: in operation, operating
(adjective) fit or ready for use or service Synonyms: functional, operable, usable, useable
operationalism (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it
operationalist (adjective) of or relating to or espousing operationalism
operationally (adverb) in respect to operation
operations (noun) financial transactions at a brokerage; having to do with the execution of trades and keeping customer records Synonyms: trading operations
operative (adjective) being in force or having or exerting force
(adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine Synonyms: surgical
(adjective) (of e.g. a machine) performing or capable of performing Synonyms: functional, running, working
(adjective) effective; producing a desired effect
(noun) someone who can be employed as a detective to collect information and assist in criminal investigations Synonyms: PI, private detective, private eye, private investigator, shamus, sherlock
(noun) a person secretly employed in espionage for a government Synonyms: intelligence agent, intelligence officer, secret agent
operatively (adverb) in a manner to produce an effect
operator (noun) an agent that operates some apparatus or machine Synonyms: manipulator
(noun) someone who owns or operates a business
(noun) a shrewd or unscrupulous person who knows how to circumvent difficulties Synonyms: hustler, wheeler dealer
(noun) a speculator who trades aggressively on stock or commodity markets
(noun) (mathematics) a symbol or function representing a mathematical operation
operculate (adjective) having an operculum Synonyms: operculated
operculated (adjective) having an operculum Synonyms: operculate
operculum (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
operetta (noun) a short amusing opera Synonyms: light opera
operon (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene
operose (adjective) characterized by effort to the point of exhaustion; especially physical effort Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome
operoseness (noun) the quality of requiring extended effort Synonyms: laboriousness, toilsomeness
ophidian (noun) limbless scaly elongate reptile; some are venomous Synonyms: serpent, snake
ophidism (noun) poisoning by snake venom
ophiolatry (noun) the worship of snakes Synonyms: serpent-worship
ophryon (noun) the craniometric point in the midline of the forehead immediately above the orbits
ophthalmectomy (noun) surgical removal of an eye
ophthalmia (noun) severe conjunctivitis Synonyms: ophthalmitis
ophthalmic (adjective) of or relating to ophthalmology
(adjective) of or relating to or resembling the eye Synonyms: ocular, optic, optical
ophthalmitis (noun) severe conjunctivitis Synonyms: ophthalmia
ophthalmologist (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye Synonyms: eye doctor, oculist
ophthalmology (noun) the branch of medicine concerned with the eye and its diseases
ophthalmoplegia (noun) paralysis of the motor nerves of the eye
ophthalmoscope (noun) medical instrument for examining the retina of the eye
ophthalmoscopy (noun) examination of the interior of an eye using an ophthalmoscope
opiate (noun) a narcotic drug that contains opium or an opium derivative
opine (verb) expect, believe, or suppose Synonyms: guess, imagine, reckon, suppose, think
(verb) express one's opinion openly and without fear or hesitation Synonyms: animadvert, sound off, speak out, speak up
opinion (noun) the reason for a court's judgment (as opposed to the decision itself) Synonyms: ruling
(noun) a personal belief or judgment that is not founded on proof or certainty Synonyms: persuasion, sentiment, thought, view
(noun) a belief or sentiment shared by most people; the voice of the people Synonyms: popular opinion, public opinion, vox populi
(noun) a vague idea in which some confidence is placed Synonyms: belief, feeling, impression, notion
(noun) the legal document stating the reasons for a judicial decision Synonyms: judgement, judgment, legal opinion
(noun) a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof Synonyms: view
opinionated (adjective) obstinate in your opinions Synonyms: opinionative, self-opinionated
opinionative (adjective) obstinate in your opinions Synonyms: opinionated, self-opinionated
opisthognathous (adjective) having receding jaws
opisthorchiasis (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia
opisthotonos (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back
opium (noun) an addictive narcotic extracted from seed capsules of the opium poppy
opopanax (noun) an odorous gum resin formerly used in medicines
opossum (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America Synonyms: possum
(noun) small furry Australian arboreal marsupials having long usually prehensile tails Synonyms: phalanger, possum
oppa (noun) a male who is older than the speaker, especially used by Korean female
opponent (adjective) characterized by active hostility Synonyms: opposing
(noun) someone who offers opposition Synonyms: adversary, antagonist, opposer, resister
(noun) a contestant that you are matched against Synonyms: opposite, opposition
opportune (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose
opportunely (adverb) conveniently
opportuneness (noun) timely convenience Synonyms: patness, timeliness
opportunism (noun) taking advantage of opportunities without regard for the consequences for others Synonyms: expedience, self-interest, self-seeking
opportunist (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit Synonyms: opportunistic, timeserving
(noun) a person who places expediency above principle Synonyms: self-seeker
opportunistic (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit Synonyms: opportunist, timeserving
opportunity (noun) a possibility due to a favorable combination of circumstances Synonyms: chance
opposable (adjective) capable of being placed opposite to something Synonyms: apposable
oppose (verb) be resistant to Synonyms: contradict, controvert
(verb) be against; express opposition to
(verb) set into opposition or rivalry Synonyms: match, pit, play off
(verb) fight against or resist strongly Synonyms: defend, fight, fight back, fight down
(verb) act against or in opposition to Synonyms: react
(verb) contrast with equal weight or force Synonyms: counterbalance
opposed (adjective) being in opposition or having an opponent
opposer (noun) someone who offers opposition Synonyms: adversary, antagonist, opponent, resister
opposing (adjective) characterized by active hostility Synonyms: opponent
opposite (adjective) of leaves etc; growing in pairs on either side of a stem Synonyms: paired
(adjective) characterized by opposite extremes; completely opposed Synonyms: diametric, diametrical, polar
(adjective) the other one of a complementary pair
(adjective) being directly across from each other; facing
(adjective) altogether different in nature or quality or significance
(adjective) moving or facing away from each other
(noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other Synonyms: antonym, opposite word
(noun) a contestant that you are matched against Synonyms: opponent, opposition
(noun) a relation of direct opposition Synonyms: contrary, reverse
(noun) something inverted in sequence or character or effect Synonyms: inverse
(adverb) directly facing each other Synonyms: face-to-face, face to face
oppositely (adverb) in an opposite position
oppositeness (noun) the relation between opposed entities Synonyms: opposition
opposition (noun) the act of hostile groups opposing each other Synonyms: confrontation
(noun) the action of opposing something that you disapprove or disagree with Synonyms: resistance
(noun) a body of people united in opposing something
(noun) an armed adversary (especially a member of an opposing military force) Synonyms: enemy, foe, foeman
(noun) a contestant that you are matched against Synonyms: opponent, opposite
(noun) a direction opposite to another
(noun) the relation between opposed entities Synonyms: oppositeness
oppositionality (noun) The quality of opposing or of being in conflict.
oppositive (adjective) expressing antithesis or opposition Synonyms: adversative
oppress (verb) come down on or keep down by unjust use of one's authority Synonyms: crush, suppress
(verb) cause to suffer Synonyms: persecute
oppressed (adjective) burdened psychologically or mentally Synonyms: laden
oppression (noun) the act of subjugating by cruelty Synonyms: subjugation
(noun) a feeling of being oppressed Synonyms: oppressiveness
(noun) the state of being kept down by unjust use of force or authority:

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