| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| imitator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, emulator |
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| (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: impersonator |
| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
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| impostor | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, pretender, pseud, pseudo, role player, sham, shammer |
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| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
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| incriminatory | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminating |
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| incubator | (noun) apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants | Synonyms: brooder |
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| inculpatory | (adjective) causing blame to be imputed to | Synonyms: inculpative |
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| indicator | (noun) a device for showing the operating condition of some system | - |
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| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index, index number, indicant |
| (noun) a signal for attracting attention | - |
| (noun) (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction | - |
| indicatory | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, revelatory, significative, suggestive |
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| inductor | (noun) an electrical device (typically a conducting coil) that introduces inductance into a circuit | Synonyms: inductance |
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| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| inflator | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflater |
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| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| ingratiatory | (adjective) calculated to please or gain favor | Synonyms: ingratiating, insinuating |
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| (adjective) pleasingly persuasive or intended to persuade | Synonyms: coaxing |
| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
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| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| inheritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, heritor |
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| inhibitor | (noun) a substance that retards or stops an activity | - |
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| inhibitory | (adjective) restrictive of action | Synonyms: repressing, repressive |
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| initiator | (noun) a person who initiates a course of action | Synonyms: instigator |
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| initiatory | (adjective) serving to set in motion | Synonyms: first, inaugural, initiative, maiden |
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| injector | (noun) a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.) | - |
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| (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, steam ejector, steam injector, thermocompressor |
| innovator | (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, pioneer, trailblazer |
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| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
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| inquisitor | (noun) a questioner who is excessively harsh | Synonyms: interrogator |
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| inquisitorial | (adjective) especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge | - |
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| (adjective) having the authority to conduct official investigations | - |
| (adjective) marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor | - |
| inquisitory | (adjective) diligent and thorough in inquiry or investigation | Synonyms: probing, searching |
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| inspector | (noun) an investigator who observes carefully | Synonyms: examiner |
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| (noun) a high ranking police officer | - |
| inspectorate | (noun) a body of inspectors | - |
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| inspectorship | (noun) the office of inspector | - |
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| inspiratory | (adjective) pertaining to the drawing in phase of respiration | - |
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| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
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| (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, provoker |
| instillator | (noun) medical apparatus that puts a liquid into a cavity drop by drop | - |
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| instructor | (noun) a person whose occupation is teaching | Synonyms: teacher |
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| instructorship | (noun) the position of instructor | - |
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| insulator | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, nonconductor |
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| integrator | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: planimeter |
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| interceptor | (noun) a fast maneuverable fighter plane designed to intercept enemy aircraft | - |
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| interlocutor | (noun) a person who takes part in a conversation | Synonyms: conversational partner |
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| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: middleman |
| interlocutory | (adjective) consisting of dialogue | - |
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| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
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| interoceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: enteroceptor |
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| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
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| interrogatory | (adjective) relating to the use of or having the nature of an interrogation | Synonyms: interrogative |
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| (noun) formal systematic questioning | Synonyms: examination, interrogation |
| introductoriness | (noun) The quality of being introducing; of giving a preview or idea of. | - |
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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
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| inventor | (noun) someone who is the first to think of or make something | Synonyms: artificer, discoverer |
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| inventory | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventorying, stock-taking, stocktaking |
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| (noun) the merchandise that a shop has on hand | Synonyms: stock |
| (noun) a collection of resources | Synonyms: armory, armoury |
| (noun) a detailed list of all the items in stock | Synonyms: stock list |
| (noun) (accounting) the value of a firm's current assets including raw materials and work in progress and finished goods | - |
| (verb) make or include in an itemized record or report | Synonyms: stock-take, take stock |
| inventorying | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventory, stock-taking, stocktaking |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| investor | (noun) someone who commits capital in order to gain financial returns | - |
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| invigilator | (noun) someone who watches examination candidates to prevent cheating | - |
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| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
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| invitatory | (adjective) conveying an invitation | - |
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| janitor | (noun) someone employed to clean and maintain a building | - |
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| judicatory | (noun) the system of law courts that administer justice and constitute the judicial branch of government | Synonyms: judicature, judicial system, judiciary |
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| justificatory | (adjective) attempting to justify or defend in speech or writing | Synonyms: defensive, justificative |
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| (adjective) providing justification | Synonyms: justificative, vindicatory |
| ketorolac | (noun) nonsteroidal anti-inflammatory (trade name Torodal) that is given only orally | Synonyms: Torodal |
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| laboratory | (noun) a workplace for the conduct of scientific research | Synonyms: lab, research lab, research laboratory, science lab, science laboratory |
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| (noun) a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation | Synonyms: testing ground |
| lachrymator | (noun) a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds | Synonyms: lacrimator, tear gas, teargas |
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| lachrymatory | (adjective) relating to or prompting tears | Synonyms: lacrimatory |
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| lacrimator | (noun) a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds | Synonyms: lachrymator, tear gas, teargas |
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| lacrimatory | (adjective) relating to or prompting tears | Synonyms: lachrymatory |
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| laminator | (noun) Any of a range of machines used for lamination. | Synonyms: laminating machine |
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| (noun) a person who makes laminates (especially plastic laminates) | - |
| lapidator | (noun) an attacker who pelts the victim with stones (especially with intent to kill) | Synonyms: stoner |
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| laudator | (noun) someone who communicates high praise | Synonyms: extoller, lauder |
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| laudatory | (adjective) full of or giving praise | Synonyms: praiseful, praising |
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| lavatory | (noun) a room or building equipped with one or more toilets | Synonyms: bathroom, can, john, lav, privy, toilet |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: basin, washbasin, washbowl, washstand |
| (noun) a toilet that is cleaned of waste by the flow of water through it | Synonyms: flush toilet |
| lector | (noun) a public lecturer at certain universities | Synonyms: lecturer, reader |
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| (noun) someone who reads the lessons in a church service; someone ordained in a minor order of the Roman Catholic Church | Synonyms: reader |
| legislator | (noun) someone who makes or enacts laws | - |
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| legislatorship | (noun) the office of legislator | - |
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| leptorhine | (adjective) having a long narrow nose | Synonyms: leptorrhine, leptorrhinian, leptorrhinic |
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| leptorrhine | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhinian, leptorrhinic |
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| leptorrhinian | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinic |
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| leptorrhinic | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinian |
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| levator | (noun) a muscle that serves to lift some body part (as the eyelid or lip) | - |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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| liberator | (noun) someone who releases people from captivity or bondage | - |
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| liquidator | (noun) (law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties | Synonyms: receiver |
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| (noun) a criminal who commits homicide (who performs the unlawful premeditated killing of another human being) | Synonyms: manslayer, murderer |
| litigator | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigant |
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| litoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: littoral, littoral zone, sands |
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| littoral | (adjective) of or relating to a coastal or shore region | - |
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| (noun) the region of the shore of a lake or sea or ocean | Synonyms: litoral, littoral zone, sands |
| locator | (noun) a person who fixes the boundaries of land claims | Synonyms: locater |
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| locomotor | (adjective) of or relating to locomotion | Synonyms: locomotive |
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| lubricator | (noun) a substance capable of reducing friction by making surfaces smooth or slippery | Synonyms: lube, lubricant, lubricating substance |
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| machinator | (noun) a member of a conspiracy | Synonyms: coconspirator, conspirator, plotter |
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| malefactor | (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, crook, felon, outlaw |
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| mandator | (noun) an authority who issues a mandate | - |
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| mandatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, obligatorily |
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| mandatory | (adjective) required by rule | Synonyms: compulsory, required |
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| (noun) a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves | Synonyms: mandate |
| (noun) the recipient of a mandate | Synonyms: mandatary |
| manipulator | (noun) an agent that operates some apparatus or machine | Synonyms: operator |
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| (noun) a person who handles things manually | - |
| maniraptor | (noun) advanced carnivorous theropod; regarded as surviving today as living birds | - |
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| manufactory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: factory, manufacturing plant, mill |
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| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
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| mediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, intermediator |
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| mediatorial | (adjective) of or relating to a mediator or the duties of a mediator | - |
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| mediatory | (adjective) of or related to or directed toward mediation | - |
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