| histaminase | (noun) enzyme that acts as a catalyst in converting histidine to histamine | - |
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| histamine | (noun) amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions | - |
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| histidine | (noun) an essential amino acid found in proteins that is important for the growth and repair of tissue | - |
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| histiocyte | (noun) a macrophage that is found in connective tissue | - |
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| histiocytosis | (noun) a blood disease characterized by an abnormal multiplication of macrophages | - |
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| histocompatibility | (noun) condition in which the cells of one tissue can survive in the presence of cells of another tissue | - |
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| histogram | (noun) a bar chart representing a frequency distribution; heights of the bars represent observed frequencies | - |
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| histoincompatibility | (noun) incompatibility in which one person's tissue cannot be transplanted to another person | - |
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| histologist | (noun) anatomist who specializes in the microscopic study of animal tissues | - |
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| histology | (noun) the branch of biology that studies the microscopic structure of animal or plant tissues | - |
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| histone | (noun) a simple protein containing mainly basic amino acids; present in cell nuclei in association with nucleic acids | - |
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| historian | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historiographer |
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| historicalness | (noun) significance owing to its history | - |
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| (noun) the state of having in fact existed in the past | - |
| historicism | (noun) a theory that social and cultural events are determined by history | - |
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| historiographer | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historian |
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| historiography | (noun) the writing of history | - |
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| (noun) a body of historical literature | - |
| history | (noun) the discipline that records and interprets past events involving human beings | - |
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| (noun) all that is remembered of the past as preserved in writing; a body of knowledge | - |
| (noun) a record or narrative description of past events | Synonyms: account, chronicle, story |
| (noun) the aggregate of past events | - |
| (noun) the continuum of events occurring in succession leading from the past to the present and even into the future | - |
| histrion | (noun) a theatrical performer | Synonyms: actor, player, role player, thespian |
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| histrionics | (noun) a performance of a play | Synonyms: representation, theatrical, theatrical performance |
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| (noun) a deliberate display of emotion for effect | - |
| hobbyist | (noun) a person who pursues an activity in their spare time for pleasure | - |
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| hoist | (noun) lifting device for raising heavy or cumbersome objects | - |
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| hoister | (noun) an operator of a hoist | - |
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| hornist | (noun) a musician who plays a horn (especially a French horn) | - |
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| horologist | (noun) someone who makes or repairs watches | Synonyms: horologer, watchmaker |
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| horticulturist | (noun) an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants) | Synonyms: plantsman |
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| humanist | (noun) a classical scholar or student of the liberal arts | - |
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| (noun) an advocate of the principles of humanism; someone concerned with the interests and welfare of humans | Synonyms: humanitarian |
| humorist | (noun) someone who acts, speaks or writes in an amusing way | Synonyms: humourist |
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| humourist | (noun) someone who acts, speaks or writes in an amusing way | Synonyms: humorist |
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| hydrologist | (noun) a geologist skilled in hydrology | - |
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| hygienist | (noun) a medical specialist in hygiene | - |
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| hypnotist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotizer, mesmerist, mesmerizer |
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| ichthyologist | (noun) a zoologist who studies fishes | - |
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| idealist | (noun) someone guided more by ideals than by practical considerations | Synonyms: dreamer |
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| ideologist | (noun) an advocate of some ideology | Synonyms: ideologue |
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| illusionist | (noun) a person with unusual powers of foresight | Synonyms: seer, visionary |
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| (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, magician, prestidigitator |
| immunochemistry | (noun) the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies) | Synonyms: chemoimmunology |
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| immunohistochemistry | (noun) an assay that shows specific antigens in tissues by the use of markers that are either fluorescent dyes or enzymes (such as horseradish peroxidase) | - |
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| immunologist | (noun) a medical scientist who specializes in immunology | - |
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| imperialist | (noun) a believer in imperialism | - |
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| impressionist | (noun) an artist who follows the theories of Impressionism | - |
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| inconsistency | (noun) the quality of being inconsistent and lacking a harmonious uniformity among things or parts | - |
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| (noun) the relation between propositions that cannot both be true at the same time | Synonyms: incompatibility, mutual exclusiveness, repugnance |
| indistinctness | (noun) the quality of being indistinct and without sharp outlines | Synonyms: blurriness, fogginess, fuzziness, softness |
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| indistinguishability | (noun) exact sameness | Synonyms: identicalness, identity |
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| individualist | (noun) a person who pursues independent thought or action | - |
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| industrialist | (noun) someone who manages or has significant financial interest in an industrial enterprise | - |
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| insistence | (noun) the act of insisting on something | Synonyms: insistency |
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| (noun) continual and persistent demands | Synonyms: insisting |
| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistency, press, pressure |
| insistency | (noun) the act of insisting on something | Synonyms: insistence |
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| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistence, press, pressure |
| insisting | (noun) continual and persistent demands | Synonyms: insistence |
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| instrumentalist | (noun) someone who plays a music as a profession | Synonyms: musician, player |
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| insurrectionist | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurgent, rebel |
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| internationalist | (noun) an advocate of internationalism | - |
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| (noun) a member of a socialist or communist international | - |
| internist | (noun) a specialist in internal medicine | - |
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| ironist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ridiculer, satirist |
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| irredentist | (noun) an advocate of irredentism | Synonyms: irridentist |
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| irreligionist | (noun) someone who is indifferent or hostile to religion | - |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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| isolationist | (noun) an advocate of isolationism in international affairs | - |
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| isthmus | (noun) a cord-like tissue connecting two larger parts of an anatomical structure | Synonyms: band |
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| (noun) a relatively narrow strip of land (with water on both sides) connecting two larger land areas | - |
| jingoist | (noun) an extreme bellicose nationalist | Synonyms: chauvinist, flag-waver, hundred-percenter, jingo, patrioteer |
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| joist | (noun) beam used to support floors or roofs | - |
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| journalist | (noun) a writer for newspapers and magazines | - |
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| (noun) someone who keeps a diary or journal | Synonyms: diarist, diary keeper |
| jurist | (noun) a legal scholar versed in civil law or the law of nations | Synonyms: legal expert |
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| (noun) a public official authorized to decide questions brought before a court of justice | Synonyms: judge, justice |
| kabbalist | (noun) an expert who is highly skilled in obscure or difficult or esoteric matters | Synonyms: cabalist |
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| keister | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| keyboardist | (noun) a musician who plays a keyboard instrument | - |
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| landscapist | (noun) someone who paints landscapes | - |
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| (noun) someone who arranges features of the landscape or garden attractively | Synonyms: landscape architect, landscape gardener, landscaper |
| lapidarist | (noun) an expert on precious stones and the art of cutting and engraving them | Synonyms: lapidary |
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| lapidist | (noun) a skilled worker who cuts and engraves precious stones | Synonyms: lapidary |
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| larcenist | (noun) a person who commits larceny | Synonyms: larcener |
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| leftist | (noun) a person who belongs to the political left | Synonyms: collectivist, left-winger |
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| leister | (noun) a spear with three or more prongs; used for spearing fish (especially salmon) | - |
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| lepidopterist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterologist |
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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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| lexicologist | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicographer |
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| lexicostatistics | (noun) a statistical technique used in glottochronology; used to estimate how long ago different languages evolved from a common source language | - |
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| liberalist | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberal, progressive |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| limnologist | (noun) a specialist in the study of freshwater ponds and lakes | - |
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| linguist | (noun) a person who speaks more than one language | Synonyms: polyglot |
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| (noun) a specialist in linguistics | Synonyms: linguistic scientist |
| linguistics | (noun) the scientific study of language | - |
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| (noun) the humanistic study of language and literature | Synonyms: philology |
| list | (noun) the property possessed by a line or surface that departs from the vertical | Synonyms: inclination, lean, leaning, tilt |
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| (noun) a database containing an ordered array of items (names or topics) | Synonyms: listing |
| listener | (noun) someone who listens attentively | Synonyms: attender, auditor, hearer |
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| listenership | (noun) all the listeners collectively of a particular radio programme, station, or broadcaster. | - |
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| listening | (noun) the act of hearing attentively | Synonyms: hearing |
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| lister | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister plough, lister plow, middle buster, middlebreaker |
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| (noun) assessor who makes out the tax lists | - |
| listeria | (noun) any species of the genus Listeria | - |
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| listeriosis | (noun) an infectious disease of animals and humans (especially newborn or immunosuppressed persons) caused by the bacterium Listeria monocytogenes; in sheep and cattle the infection frequently involves the central nervous system and causes various neurological symptoms | Synonyms: listeria meningitis |
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| listing | (noun) the act of making a list of items | Synonyms: itemisation, itemization |
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| (noun) a database containing an ordered array of items (names or topics) | Synonyms: list |
| listlessness | (noun) inactivity resulting from lethargy and lack of vigor or energy | Synonyms: torpidity, torpidness, torpor |
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| (noun) a feeling of lack of interest or energy | Synonyms: languor, lassitude |
| liturgist | (noun) an authority on liturgies | - |
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| lobbyist | (noun) someone who is employed to persuade legislators to vote for legislation that favors the lobbyist's employer | - |
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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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| logomachist | (noun) someone given to disputes over words | Synonyms: logomach |
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| loyalist | (noun) a person who is loyal to their allegiance (especially in times of revolt) | Synonyms: stalwart |
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| lutanist | (noun) a musician who plays the lute | Synonyms: lutenist, lutist |
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| lutenist | (noun) a musician who plays the lute | Synonyms: lutanist, lutist |
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| lutist | (noun) a musician who plays the lute | Synonyms: lutanist, lutenist |
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