| gastrula | (noun) double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm | - |
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| gastrulation | (noun) the process in which a gastrula develops from a blastula by the inward migration of cells | - |
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| geochemistry | (noun) the chemistry of the earth's crust | - |
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| geostrategic | (adjective) of or relating to geostrategy | - |
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| geostrategy | (noun) the branch of geopolitics dealing with strategy | - |
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| guestroom | (noun) a bedroom that is kept for the use of guests | - |
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| hairstreak | (noun) small butterflies having striped markings under the wings | Synonyms: hairstreak butterfly |
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| hamstring | (noun) one of the tendons at the back of the knee | Synonyms: hamstring tendon |
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| (verb) cripple by cutting the hamstring | - |
| (verb) make ineffective or powerless | - |
| headmistress | (noun) a woman headmaster | - |
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| headmistressship | (noun) the position of headmistress | - |
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| headstream | (noun) a stream that forms the source of a river | - |
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| headstrong | (adjective) habitually disposed to disobedience and opposition | Synonyms: froward, self-willed, wilful, willful |
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| heartstrings | (noun) your deepest feelings of love and compassion | - |
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| heatstroke | (noun) collapse caused by exposure to excessive heat | Synonyms: heat hyperpyrexia |
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| heterostracan | (noun) extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian | - |
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| hexestrol | (noun) estrogen compound used to treat menstrual irregularities and menopausal symptoms and to prevent pregnancy | - |
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| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| histrion | (noun) a theatrical performer | Synonyms: actor, player, role player, thespian |
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| histrionic | (adjective) characteristic of acting or a stage performance; often affected | Synonyms: melodramatic |
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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 | - |
| homestretch | (noun) the straight stretch of a racetrack leading to the finish line | - |
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| (noun) the end of an enterprise | - |
| illustrate | (verb) clarify by giving an example of | Synonyms: exemplify, instance |
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| (verb) depict with an illustration | - |
| (verb) supply with illustrations | - |
| illustration | (noun) a visual representation (a picture or diagram) that is used to make some subject more pleasing or easier to understand | - |
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| (noun) an item of information that is typical of a class or group | Synonyms: example, instance, representative |
| (noun) artwork that helps make something clear or attractive | - |
| (noun) showing by example | Synonyms: exemplification |
| illustrative | (adjective) clarifying by use of examples | Synonyms: exemplifying |
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| (adjective) serving to demonstrate | Synonyms: demonstrative |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| illustrious | (adjective) having or conferring glory | - |
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| (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, notable, noted, renowned |
| illustriously | (adverb) in an illustrious manner | - |
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| illustriousness | (noun) the property possessed by something or someone of outstanding importance or eminence | Synonyms: greatness |
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| 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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| indestructibility | (noun) the strength to resist destruction | - |
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| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| industrial | (adjective) having highly developed industries | - |
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| (adjective) of or relating to or resulting from industry | - |
| (adjective) employed in industry | - |
| (adjective) suitable to stand up to hard wear | - |
| industrialisation | (noun) the development of industry on an extensive scale | Synonyms: industrial enterprise, industrialization |
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| industrialise | (verb) develop industry; become industrial | Synonyms: industrialize |
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| (verb) organize (the production of something) into an industry | Synonyms: industrialize |
| industrialised | (adjective) made industrial; converted to industrialism | Synonyms: industrialized |
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| industrialism | (noun) an economic system built on large industries rather than on agriculture or craftsmanship | - |
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| industrialist | (noun) someone who manages or has significant financial interest in an industrial enterprise | - |
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| industrialization | (noun) the development of industry on an extensive scale | Synonyms: industrial enterprise, industrialisation |
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| industrialize | (verb) develop industry; become industrial | Synonyms: industrialise |
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| (verb) organize (the production of something) into an industry | Synonyms: industrialise |
| industrialized | (adjective) made industrial; converted to industrialism | Synonyms: industrialised |
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| industrially | (adverb) by industrial means | - |
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| industrious | (adjective) characterized by hard work and perseverance | Synonyms: hardworking, tireless, untiring |
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| (adjective) working hard to promote an enterprise | Synonyms: energetic, gumptious, up-and-coming |
| industriously | (adverb) in an industrious manner | - |
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| industriousness | (noun) persevering determination to perform a task | Synonyms: diligence, industry |
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| industry | (noun) the organized action of making of goods and services for sale | Synonyms: manufacture |
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| (noun) persevering determination to perform a task | Synonyms: diligence, industriousness |
| (noun) the people or companies engaged in a particular kind of commercial enterprise | - |
| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| instroke | (noun) the stroke of an engine piston moving away from the crankshaft | - |
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| instruct | (verb) impart skills or knowledge to | Synonyms: learn, teach |
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| (verb) give instructions or directions for some task | - |
| (verb) make aware of | Synonyms: apprise, apprize |
| instruction | (noun) the profession of a teacher | Synonyms: pedagogy, teaching |
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| (noun) the activities of educating or instructing; activities that impart knowledge or skill | Synonyms: didactics, education, educational activity, pedagogy, teaching |
| (noun) (computer science) a line of code written as part of a computer program | Synonyms: command, program line, statement |
| (noun) a message describing how something is to be done | Synonyms: direction |
| instructional | (adjective) of or relating to or used in instruction | - |
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| instructions | (noun) a manual usually accompanying a technical device and explaining how to install or operate it | Synonyms: book of instructions, instruction manual, operating instructions |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| instructively | (adverb) in an informative manner | Synonyms: informatively |
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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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| instructress | (noun) a woman instructor | - |
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| instrument | (noun) the means whereby some act is accomplished | Synonyms: tool |
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| (noun) a device that requires skill for proper use | - |
| (noun) any of various devices or contrivances that can be used to produce musical tones or sounds | Synonyms: musical instrument |
| (noun) (law) a document that states some contractual relationship or grants some right | Synonyms: legal document, legal instrument, official document |
| (noun) the semantic role of the entity (usually inanimate) that the agent uses to perform an action or start a process | Synonyms: instrumental role |
| (noun) a person used by another to gain an end | Synonyms: cat's-paw, pawn |
| (verb) address a legal document to | - |
| (verb) write an instrumental score for | Synonyms: instrumentate |
| (verb) equip with instruments for measuring, recording, or controlling | - |
| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| instrumentalism | (noun) a system of pragmatic philosophy that considers idea to be instruments that should guide our actions and their value is measured by their success | - |
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| instrumentalist | (noun) someone who plays a music as a profession | Synonyms: musician, player |
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| instrumentality | (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentation, means |
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| (noun) the quality of being instrumental for some purpose | - |
| (noun) a subsidiary organ of government created for a special purpose | - |
| instrumentate | (verb) write an instrumental score for | Synonyms: instrument |
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| instrumentation | (noun) the act of providing or using the instruments needed for some implementation | - |
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| (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: orchestration |
| (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentality, means |
| (noun) the instruments called for in a musical score or arrangement for a band or orchestra | - |
| interstratify | (verb) arrange rocks in alternating strata | - |
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| jackstraw | (noun) a thin strip of wood used in playing the game of jackstraws | Synonyms: spillikin |
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| jackstraws | (noun) a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others | Synonyms: spillikins |
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| jockstrap | (noun) a support for the genitals worn by men engaging in strenuous exercise | Synonyms: athletic supporter, jock, supporter, suspensor |
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| kestrel | (noun) small Old World falcon that hovers in the air against a wind | Synonyms: Falco tinnunculus |
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| (noun) small North American falcon | Synonyms: American kestrel, Falco sparverius, sparrow hawk |
| keystroke | (noun) the stroke of a key; one depression of a key on a keyboard | Synonyms: key stroke |
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| klystron | (noun) an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation | - |
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| lacklustre | (adjective) lacking luster or shine | Synonyms: lackluster, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lusterless, lustreless |
| lacustrine | (adjective) of or relating to or living near lakes | - |
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| latchstring | (noun) opener consisting of a string that can be passed through a hole in a door for raising the latch from outside | - |
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| lipochondrodystrophy | (noun) hereditary disease (autosomal recessive) consisting of an error is mucopolysaccharide metabolism; characterized by severe abnormalities in development of skeletal cartilage and bone and mental retardation | Synonyms: dysostosis multiplex, gargoylism, Hurler's disease, Hurler's syndrome |
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| loosestrife | (noun) any of numerous herbs and subshrubs of the genus Lythrum | - |
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| (noun) any of various herbs and subshrubs of the genus Lysimachia | - |
| lustrate | (verb) purify by means of a ritual; also used in post-Communist countries to refer to the political cleansing of former officials | - |
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| lustre | (noun) a surface coating for ceramics or porcelain | Synonyms: luster |
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| (noun) a quality that outshines the usual | Synonyms: brilliancy, luster, splendor, splendour |
| (noun) the visual property of something that shines with reflected light | Synonyms: luster, sheen, shininess |
| lustreless | (adjective) lacking luster or shine | Synonyms: lackluster, lacklustre, lusterless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lacklustre, lusterless |
| lustrelessness | (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: flatness, lusterlessness, mat, matt, matte |
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| lustrous | (adjective) brilliant | - |
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| (adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow | Synonyms: bright, burnished, shining, shiny |
| (adjective) reflecting light | Synonyms: glistening, glossy, sheeny, shining, shiny |
| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| maelstrom | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: vortex, whirlpool |
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| maestro | (noun) an artist of consummate skill | Synonyms: master |
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| magistracy | (noun) the position of magistrate | Synonyms: magistrature |
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| magistrate | (noun) a lay judge or civil authority who administers the law (especially one who conducts a court dealing with minor offenses) | - |
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| magistrature | (noun) the position of magistrate | Synonyms: magistracy |
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| mainstream | (noun) the prevailing current of thought | - |
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| mainstreamed | (adjective) (of the handicapped) placed in regular school classes | - |
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| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| megestrol | (noun) a synthetic progestational compound used to treat endometrial carcinoma | Synonyms: megestrol acetate |
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| menstrual | (adjective) of or relating to menstruation or the menses | Synonyms: catamenial |
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| menstruate | (verb) undergo menstruation | Synonyms: flow |
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| menstruation | (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruum, period |
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| menstruum | (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, period |
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| (noun) (archaic) a solvent | - |
| mestranol | (noun) a synthetic form of estrogen used in combination with a progestin in oral contraceptives | - |
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| midstream | (noun) the middle of a stream | - |
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| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| ministrant | (adjective) giving practical help to | Synonyms: attending |
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| (noun) someone who serves as a minister | - |
| ministration | (noun) assistance in time of difficulty | Synonyms: relief, succor, succour |
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