| intrenchment | (noun) an entrenched fortification; a position protected by trenches | Synonyms: entrenchment |
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| intrepidity | (noun) resolute courageousness | Synonyms: dauntlessness |
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| intricacy | (noun) marked by elaborately complex detail | Synonyms: elaborateness, elaboration, involution |
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| intrigue | (noun) a crafty and involved plot to achieve your (usually sinister) ends | Synonyms: machination |
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| (noun) a clandestine love affair | - |
| intriguer | (noun) a person who devises plots or intrigues | Synonyms: designer |
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| intro | (noun) formally making a person known to another or to the public | Synonyms: introduction, presentation |
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| (noun) a brief introductory passage to a piece of popular music | - |
| introduction | (noun) the act of putting one thing into another | Synonyms: insertion, intromission |
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| (noun) the act of beginning something new | Synonyms: debut, entry, first appearance, launching, unveiling |
| (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, origination |
| (noun) the first section of a communication | - |
| (noun) formally making a person known to another or to the public | Synonyms: intro, presentation |
| (noun) a basic or elementary instructional text | - |
| (noun) a new proposal | - |
| introductoriness | (noun) The quality of being introducing; of giving a preview or idea of. | - |
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| introit | (noun) a composition of vocal music that is appropriate for opening church services | - |
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| introitus | (noun) entrance or opening to a hollow organ or tube (especially the vaginal opening) | - |
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| introject | (noun) (psychoanalysis) parental figures (and their values) that you introjected as a child; the voice of conscience is usually a parent's voice internalized | - |
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| introjection | (noun) (psychoanalysis) the internalization of the parent figures and their values; leads to the formation of the superego | - |
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| (noun) (psychology) unconscious internalization of aspects of the world (especially aspects of persons) within the self in such a way that the internalized representation takes over the psychological functions of the external objects | - |
| intromission | (noun) the act of putting one thing into another | Synonyms: insertion, introduction |
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| intron | (noun) sequence of a eukaryotic gene's DNA that is not translated into a protein | Synonyms: noncoding DNA |
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| introspection | (noun) the contemplation of your own thoughts and desires and conduct | Synonyms: self-contemplation, self-examination |
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| introspectionism | (noun) a doctrine that psychology must be based essentially on data derived from introspection. | - |
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| introspectiveness | (noun) thoughtfulness about your own situation and feelings | - |
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| introversion | (noun) (psychology) an introverted disposition; concern with one's own thoughts and feelings | - |
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| (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: infolding, intussusception, invagination |
| (noun) the condition of being folded inward or sheathed | Synonyms: invagination |
| introvert | (noun) (psychology) a person who tends to shrink from social contacts and to become preoccupied with their own thoughts | - |
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| intruder | (noun) someone who intrudes on the privacy or property of another without permission | Synonyms: interloper, trespasser |
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| intrusion | (noun) entry to another's property without right or permission | Synonyms: encroachment, trespass, usurpation, violation |
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| (noun) entrance by force or without permission or welcome | - |
| (noun) any entry into an area not previously occupied | Synonyms: encroachment, invasion |
| (noun) rock produced by an intrusive process | - |
| (noun) the forcing of molten rock into fissures or between strata of an earlier rock formation | - |
| intrusiveness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: meddlesomeness, officiousness |
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| isometric | (noun) a line connecting isometric points | Synonyms: isometric line |
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| isometrics | (noun) muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change) | Synonyms: isometric exercise |
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| isometropia | (noun) equality of refractive power in the two eyes | - |
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| isometry | (noun) equality of measure (e.g., equality of height above sea level or equality of loudness etc.) | - |
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| (noun) equality of elevation above sea level | - |
| (noun) a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points | - |
| (noun) the growth rates in different parts of a growing organism are the same | - |
| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| itraconazole | (noun) an oral antifungal drug (trade name Sporanox) taken for cases of fungal nail disease | Synonyms: Sporanox |
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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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| jobcentre | (noun) a government office in a town where information about available jobs is displayed and where unemployment benefits are administered | - |
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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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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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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 |
| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| ketotriose | (noun) Any ketose having three carbon atoms; in reality, only dihydroxyacetone. | - |
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| keystroke | (noun) the stroke of a key; one depression of a key on a keyboard | Synonyms: key stroke |
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| kilolitre | (noun) a metric unit of volume or capacity equal to 1000 liters | Synonyms: cubic meter, cubic metre, kiloliter |
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| kilometrage | (noun) the number of kilometres travelled by a vehicle. | - |
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| kilometre | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, klick, km |
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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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| laetrile | (noun) a substance derived from amygdalin; publicized as an antineoplastic drug although there is no supporting evidence | - |
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| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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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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| latria | (noun) the worship given to God alone | Synonyms: adoration |
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| latrine | (noun) a public toilet in a military area | - |
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| lepidobotrys | (noun) African tree often classified in other families; similar to the Costa Rican caracolito in wood structure as well as in fruit and flowers and leaves and seeds | - |
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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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| litre | (noun) a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints) | Synonyms: cubic decimeter, cubic decimetre, l, liter |
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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 | - |
| lordolatry | (noun) the worship of a lord because of his rank or title | - |
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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 |
| lustrelessness | (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: flatness, lusterlessness, mat, matt, matte |
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| 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 | - |
| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| lymantriid | (noun) dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees | Synonyms: tussock moth |
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| 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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| magnetron | (noun) a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators | - |
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| mainstream | (noun) the prevailing current of thought | - |
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| malnutrition | (noun) a state of poor nutrition; can result from insufficient or excessive or unbalanced diet or from inability to absorb foods | - |
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| maltreater | (noun) someone who abuses | Synonyms: abuser |
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| maltreatment | (noun) cruel or inhumane treatment | Synonyms: abuse, ill-treatment, ill-usage |
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| mantra | (noun) (Sanskrit) literally a `sacred utterance' in Vedism; one of a collection of orally transmitted poetic hymns | - |
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| (noun) a commonly repeated word or phrase | - |
| mantrap | (noun) a trap for catching trespassers | - |
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| (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, lulu, peach, ravisher, smasher, stunner, sweetheart |
| marquetry | (noun) inlaid veneers are fitted together to form a design or picture that is then used to ornament furniture | Synonyms: marqueterie |
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| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| matriarch | (noun) a female head of a family or tribe | Synonyms: materfamilias |
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| (noun) a feisty older woman with a big bosom (as drawn in cartoons) | - |
| matriarchate | (noun) a form of social organization in which a female is the family head and title is traced through the female line | Synonyms: matriarchy |
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| matriarchy | (noun) a form of social organization in which a female is the family head and title is traced through the female line | Synonyms: matriarchate |
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| matric | (noun) admission to a group (especially a college or university) | Synonyms: matriculation |
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| matricide | (noun) the murder of your mother | - |
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| (noun) a person who murders their mother | - |
| matriculate | (noun) someone who has been admitted to a college or university | - |
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| matriculation | (noun) admission to a group (especially a college or university) | Synonyms: matric |
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| matrikin | (noun) one related on the mother's side | Synonyms: enate, matrilineal kin, matrilineal sib, matrisib |
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| matrilineage | (noun) line of descent traced through the maternal side of the family | Synonyms: cognation, enation |
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| matrilineality | (noun) a system in which a person's descent is traced through their mother and her maternal ancestors. | - |
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| matrimony | (noun) the ceremony or sacrament of marriage | - |
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| (noun) the state of being a married couple voluntarily joined for life (or until divorce) | Synonyms: marriage, spousal relationship, union, wedlock |
| matrisib | (noun) one related on the mother's side | Synonyms: enate, matrikin, matrilineal kin, matrilineal sib |
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| matrix | (noun) mold used in the production of phonograph records, type, or other relief surface | - |
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| (noun) the formative tissue at the base of a nail | - |
| (noun) the body substance in which tissue cells are embedded | Synonyms: ground substance, intercellular substance |
| (noun) (mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules | - |
| (noun) an enclosure within which something originates or develops | - |
| (noun) (geology) a mass of fine-grained rock in which fossils, crystals, or gems are embedded | - |
| matron | (noun) a married woman (usually middle-aged with children) who is staid and dignified | - |
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| (noun) a woman in charge of nursing in a medical institution | - |
| (noun) a wardress in a prison | - |
| matronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: metronymic |
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| mattress | (noun) a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed | - |
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| mediatrix | (noun) a woman who is a mediator | - |
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| megestrol | (noun) a synthetic progestational compound used to treat endometrial carcinoma | Synonyms: megestrol acetate |
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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 | - |
| meretriciousness | (noun) an appearance of truth that is false or deceptive; seeming plausibility | Synonyms: speciousness |
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| (noun) tasteless showiness | Synonyms: brashness, flashiness, garishness, gaudiness, glitz, loudness, tawdriness |
| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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| mestranol | (noun) a synthetic form of estrogen used in combination with a progestin in oral contraceptives | - |
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| metacentre | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacenter |
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| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| methotrexate | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: amethopterin, methotrexate sodium |
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| metralgia | (noun) pain in the uterus | - |
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| metre | (noun) rhythm as given by division into parts of equal duration | Synonyms: meter, time |
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| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, meter |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, meter |
| metrestick | (noun) a rule one meter long (usually marked off in centimeters and millimeters) | Synonyms: meterstick |
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| metric | (noun) a system of related measures that facilitates the quantification of some particular characteristic | Synonyms: system of measurement |
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| (noun) a decimal unit of measurement of the metric system (based on meters and kilograms and seconds) | Synonyms: metric unit |
| (noun) a function of a topological space that gives, for any two points in the space, a value equal to the distance between them | Synonyms: metric function |