| hydrologist | (noun) a geologist skilled in hydrology | - |
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| hydrology | (noun) the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation | - |
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| ichthyologist | (noun) a zoologist who studies fishes | - |
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| ichthyology | (noun) the branch of zoology that studies fishes | - |
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| iconology | (noun) the branch of art history that studies visual images and their symbolic meaning (especially in social or political terms) | - |
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| idealogue | (noun) someone who theorizes (especially in science or art) | Synonyms: theoretician, theoriser, theorist, theorizer |
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| ideologist | (noun) an advocate of some ideology | Synonyms: ideologue |
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| ideologization | (noun) the process of giving an ideological character or interpretation to; especially of changing or interpreting in relation to a sociopolitical ideology often seen as biased or limited. | - |
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| ideologue | (noun) an advocate of some ideology | Synonyms: ideologist |
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| ideology | (noun) an orientation that characterizes the thinking of a group or nation | Synonyms: political orientation, political theory |
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| (noun) imaginary or visionary theorization | - |
| illogic | (noun) invalid or incorrect reasoning | Synonyms: illogicality, illogicalness, inconsequence |
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| illogicality | (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicalness, inconsequence |
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| illogicalness | (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicality, inconsequence |
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| immunologist | (noun) a medical scientist who specializes in immunology | - |
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| immunology | (noun) the branch of medical science that studies the body's immune system | - |
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| immunopathology | (noun) the branch of immunology that deals with pathologies of the immune system | - |
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| kilogram | (noun) one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites | Synonyms: kg, kilo |
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| kinesiology | (noun) the branch of physiology that studies the mechanics and anatomy in relation to human movement | - |
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| lepidopterologist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterist |
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| lepidopterology | (noun) the branch of entomology dealing with Lepidoptera | Synonyms: lepidoptery |
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| lexicologist | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicographer |
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| lexicology | (noun) the branch of linguistics that studies the lexical component of language | - |
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| limnologist | (noun) a specialist in the study of freshwater ponds and lakes | - |
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| limnology | (noun) the scientific study of bodies of fresh water for their biological and physical and geological properties | - |
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| lithology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: petrology |
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| liturgiology | (noun) the study of liturgies | Synonyms: liturgics |
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| log | (noun) measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water | - |
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| (noun) a written record of events on a voyage (of a ship or plane) | - |
| (noun) the exponent required to produce a given number | Synonyms: logarithm |
| (noun) a written record of messages sent or received | - |
| (noun) a segment of the trunk of a tree when stripped of branches | - |
| logagraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, anorthography |
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| loganberry | (noun) large red variety of the dewberry | - |
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| (noun) red-fruited bramble native from Oregon to Baja California | Synonyms: Rubus loganobaccus, Rubus ursinus loganobaccus |
| logarithm | (noun) the exponent required to produce a given number | Synonyms: log |
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| logbook | (noun) a book in which the log is written | - |
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| loge | (noun) balcony consisting of the forward section of a theater mezzanine | - |
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| (noun) private area in a theater or grandstand where a small group can watch the performance | Synonyms: box |
| logger | (noun) a person who fells trees | Synonyms: faller, feller, lumberjack, lumberman |
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| loggerhead | (noun) very large carnivorous sea turtle; wide-ranging in warm open seas | Synonyms: Caretta caretta, loggerhead turtle |
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| (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, lunkhead, muttonhead, numskull, shithead |
| loggia | (noun) a roofed arcade or gallery with open sides stretching along the front or side of a building; often at an upper level | - |
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| logginess | (noun) a dull and listless state resulting from weariness | Synonyms: loginess |
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| logging | (noun) the work of cutting down trees for timber | - |
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| logic | (noun) the branch of philosophy that analyzes inference | - |
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| (noun) a system of reasoning | Synonyms: logical system, system of logic |
| (noun) reasoned and reasonable judgment | - |
| (noun) the principles that guide reasoning within a given field or situation | - |
| (noun) the system of operations performed by a computer that underlies the machine's representation of logical operations | - |
| logicality | (noun) correct and valid reasoning | Synonyms: logicalness |
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| logicalness | (noun) correct and valid reasoning | Synonyms: logicality |
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| logician | (noun) a person skilled at logic | Synonyms: logistician |
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| logicism | (noun) (philosophy) the philosophical theory that all of mathematics can be derived from formal logic | - |
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| loginess | (noun) a dull and listless state resulting from weariness | Synonyms: logginess |
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| logion | (noun) a saying of Jesus that is regarded as authentic although it is not recorded in the Gospels | - |
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| logistician | (noun) a person skilled at logic | Synonyms: logician |
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| logistics | (noun) handling an operation that involves providing labor and materials be supplied as needed | - |
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| logjam | (noun) an immovable mass of logs blocking a river | - |
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| (noun) any stoppage attributable to unusual activity | - |
| logo | (noun) a company emblem or device | Synonyms: logotype |
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| logogram | (noun) a single written symbol that represents an entire word or phrase without indicating its pronunciation | Synonyms: logograph |
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| logograph | (noun) a single written symbol that represents an entire word or phrase without indicating its pronunciation | Synonyms: logogram |
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| logomach | (noun) someone given to disputes over words | Synonyms: logomachist |
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| logomachist | (noun) someone given to disputes over words | Synonyms: logomach |
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| logomachy | (noun) argument about words or the meaning of words | - |
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| logomania | (noun) pathologically excessive (and often incoherent) talking | Synonyms: logorrhea |
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| logorrhea | (noun) pathologically excessive (and often incoherent) talking | Synonyms: logomania |
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| logotype | (noun) a company emblem or device | Synonyms: logo |
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| logrolling | (noun) rotating a log rapidly in the water (as a competitive sport) | Synonyms: birling |
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| (noun) act of exchanging favors for mutual gain; especially trading of influence or votes among legislators to gain passage of certain projects | - |
| logwood | (noun) spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye | Synonyms: bloodwood tree, campeachy, Haematoxylum campechianum, logwood tree |
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| (noun) very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye | - |
| ludology | (noun) The study of games and gaming, especially video games. | Synonyms: game studies |
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| malacologist | (noun) a zoologist specializing in the study of mollusks | - |
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| malacology | (noun) the branch of zoology that studies the structure and behavior of mollusks | - |
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| mammalogist | (noun) one skilled in the study of mammals | - |
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| mammalogy | (noun) the branch of zoology that studies mammals | - |
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| meteorologist | (noun) a specialist who studies processes in the earth's atmosphere that cause weather conditions | - |
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| meteorology | (noun) the earth science dealing with phenomena of the atmosphere (especially weather) | - |
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| (noun) predicting what the weather will be | Synonyms: weather forecasting |
| methodology | (noun) the system of methods followed in a particular discipline | - |
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| (noun) the branch of philosophy that analyzes the principles and procedures of inquiry in a particular discipline | Synonyms: methodological analysis |
| metrology | (noun) the scientific study of measurement | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microbiology | (noun) the branch of biology that studies microorganisms and their effects on humans | - |
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| microblog | (noun) a blog in which there is a limitation on the length of individual postings. | - |
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| micropaleontology | (noun) the paleontology of microfossils | - |
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| mineralogist | (noun) a scientist trained in mineralogy | - |
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| mineralogy | (noun) the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them | - |
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| misology | (noun) hatred of reasoning | - |
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| mixologist | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, barkeeper, bartender |
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| mixology | (noun) skill in preparing mixed drinks | - |
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| monologist | (noun) an entertainer who performs alone | - |
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| monologue | (noun) speech you make to yourself | Synonyms: soliloquy |
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| (noun) a (usually long) dramatic speech by a single actor | - |
| (noun) a long utterance by one person (especially one that prevents others from participating in the conversation) | - |
| morphology | (noun) the branch of biology that deals with the structure of animals and plants | - |
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| (noun) studies of the rules for forming admissible words | - |
| (noun) the admissible arrangement of sounds in words | Synonyms: sound structure, syllable structure, word structure |
| (noun) the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms | Synonyms: geomorphology |
| morphophysiology | (noun) the study of anatomy in its relation to function | Synonyms: functional anatomy, physiological anatomy |
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| musicologist | (noun) a student of musicology | - |
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| musicology | (noun) the scholarly and scientific study of music | - |
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| mycologist | (noun) a botanist who specializes in the study of fungi | - |
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| mycology | (noun) the branch of botany that studies fungi and fungus-caused diseases | - |
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| myelogram | (noun) X-ray film of the spinal cord and spinal nerve roots and subarachnoid space | - |
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| myelography | (noun) roentgenography of the spinal cord to detect possible lesions (usually after injection of a contrast medium into the subarachnoid space) | - |
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| myology | (noun) the branch of physiology that studies muscles | - |
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| mythologisation | (noun) the restatement of a message as a myth | Synonyms: mythologization |
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| mythologist | (noun) an expert on mythology | - |
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| mythologization | (noun) the restatement of a message as a myth | Synonyms: mythologisation |
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| mythology | (noun) the study of myths | - |
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| (noun) myths collectively; the body of stories associated with a culture or institution or person | - |
| nanotechnology | (noun) the branch of engineering that deals with things smaller than 100 nanometers (especially with the manipulation of individual molecules) | - |
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| necrology | (noun) a notice of someone's death; usually includes a short biography | Synonyms: obit, obituary |
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| (noun) a list of people who died recently | - |
| neologism | (noun) the act of inventing a word or phrase | Synonyms: coinage, neology |
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| (noun) a newly invented word or phrase | Synonyms: coinage, neology |
| neologist | (noun) a lexicographer of new words and expressions | - |
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| neology | (noun) the act of inventing a word or phrase | Synonyms: coinage, neologism |
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| (noun) a newly invented word or phrase | Synonyms: coinage, neologism |
| neonatology | (noun) that branch of pediatric medicine concerned with the newborn; the diagnosis and treatment of neonates | - |
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| nephology | (noun) the branch of meteorology that studies clouds and cloud formation | - |
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| nephrology | (noun) the branch of medicine concerned with the kidney - its development and anatomy and physiology and disorders | - |
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| neurobiologist | (noun) a specialist in neurobiology | - |
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