| 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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| 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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| 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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| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
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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 |
| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
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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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| 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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| 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 |
| keratoacanthoma | (noun) skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar | - |
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| keratocele | (noun) hernia of the cornea | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| keratoiritis | (noun) inflammation of the cornea and the iris of the eye | - |
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| keratomalacia | (noun) softening and drying and ulceration of the cornea resulting from vitamin A deficiency; symptom of cystic fibrosis or sprue | - |
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| keratomycosis | (noun) fungal infection of the cornea | - |
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| keratonosis | (noun) any abnormal condition of the outer skin (epidermis) | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| keratoplasty | (noun) a surgical procedure in which part or all of a damaged or diseased cornea is replaced by healthy corneal tissue from a donor | Synonyms: corneal graft, corneal transplant |
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| keratoscleritis | (noun) inflammation of the cornea and sclera of the eye | - |
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| keratoscope | (noun) medical instrument to examine the cornea in order to detect irregularities in its anterior surface | - |
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| keratoscopy | (noun) examination of the cornea with a keratoscope to detect irregularities in its anterior surface | - |
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| keratosis | (noun) a skin condition marked by an overgrowth of layers of horny skin | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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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 |
| legato | (adjective) (music) without breaks between notes; smooth and connected | Synonyms: smooth |
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| (adverb) connecting the notes; in music | - |
| legislator | (noun) someone who makes or enacts laws | - |
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| legislatorship | (noun) the office of legislator | - |
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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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| lipomatosis | (noun) pathology in which fat accumulates in lipomas in the body | - |
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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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| locator | (noun) a person who fixes the boundaries of land claims | Synonyms: locater |
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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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| 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 | - |
| 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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| megaton | (noun) one million tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT | - |
| melatonin | (noun) hormone secreted by the pineal gland | - |
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| migrator | (noun) an animal (especially birds and fish) that travels between different habitats at particular times of the year | - |
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| (noun) traveler who moves from one region or country to another | Synonyms: migrant |
| migratory | (adjective) used of animals that move seasonally | - |
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| (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migrant |
| minatory | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, ominous, sinister, threatening |
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| minicalculator | (noun) (old-fashioned) a very small handheld calculator. | - |
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| mitigatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, alleviatory, lenitive, mitigative, palliative |
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| moderato | (adjective) (of tempo) moderate | - |
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| moderator | (noun) someone who mediates disputes and attempts to avoid violence | - |
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| (noun) someone who presides over a forum or debate | - |
| (noun) in the Presbyterian church, the officer who presides over a synod or general assembly | - |
| (noun) any substance used to slow down neutrons in nuclear reactors | - |
| moderatorship | (noun) the position of moderator | - |
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| monatomic | (adjective) of or relating to an element consisting of a single atom | Synonyms: monoatomic |
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| monoatomic | (adjective) of or relating to an element consisting of a single atom | Synonyms: monatomic |
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| moratorium | (noun) suspension of an ongoing activity | - |
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| (noun) a legally authorized postponement before some obligation must be discharged | - |
| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
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| mutilator | (noun) a person who mutilates or destroys or disfigures or cripples | Synonyms: maimer, mangler |
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| myxomatosis | (noun) a viral disease (usually fatal) of rabbits | - |
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| narrator | (noun) someone who tells a story | Synonyms: storyteller, teller |
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| natator | (noun) a person who travels through the water by swimming | Synonyms: bather, swimmer |
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| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| navigator | (noun) in earlier times, a person who explored by ship | - |
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| (noun) the member of an aircrew who is responsible for the aircraft's course | - |
| (noun) the ship's officer in charge of navigation | Synonyms: sailing master |
| negotiator | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiant, treater |
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| nematode | (noun) unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic | Synonyms: nematode worm, roundworm |
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| neonatology | (noun) that branch of pediatric medicine concerned with the newborn; the diagnosis and treatment of neonates | - |
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| neuroanatomic | (adjective) of or relating to neural tissue or the nervous system | Synonyms: neuroanatomical |
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| neuroanatomical | (adjective) of or relating to neural tissue or the nervous system | Synonyms: neuroanatomic |
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| neuroanatomy | (noun) the anatomy of the nervous system | - |
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| neurofibromatosis | (noun) autosomal dominant disease characterized by numerous neurofibromas and by spots on the skin and often by developmental abnormalities | Synonyms: von Recklinghausen's disease |
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| neuromatous | (adjective) of or relating to or caused by neuromas | - |
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| nominator | (noun) someone who proposes a candidate for appointment or election | - |
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| nonexploratory | (adjective) not exploratory | Synonyms: nonexplorative, unexplorative, unexploratory |
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| noninflammatory | (adjective) not inflammatory | - |
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| nonmandatory | (adjective) not required by rule or law | Synonyms: nonobligatory |
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| nonmigratory | (adjective) used of animals that do not migrate | Synonyms: resident |
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| nonobligatory | (adjective) not required by rule or law | Synonyms: nonmandatory |
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