| interval | (noun) the distance between things | Synonyms: separation |
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| (noun) a set containing all points (or all real numbers) between two given endpoints | - |
| (noun) the difference in pitch between two notes | Synonyms: musical interval |
| (noun) a definite length of time marked off by two instants | Synonyms: time interval |
| irrational | (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
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| isoclinal | (noun) an isogram connecting points of equal magnetic inclination | Synonyms: isoclinic line |
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| isohel | (noun) an isogram connecting points receiving equal amounts of sunshine | - |
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| isopropanol | (noun) alcohol used as antifreeze or a solvent | Synonyms: isopropyl alcohol |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
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| ivorybill | (noun) large black-and-white woodpecker of southern United States and Cuba having an ivory bill; nearly extinct | Synonyms: Campephilus principalis, ivory-billed woodpecker |
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| jackal | (noun) Old World nocturnal canine mammal closely related to the dog; smaller than a wolf; sometimes hunts in a pack but usually singly or as a member of a pair | - |
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| (noun) a jackal native to Europe and Asia with a golden coat | Synonyms: Canis aureus, golden jackal |
| (noun) a jackal native to Africa with a black back | Synonyms: black-backed jackal, Canis mesomelas |
| (noun) a jackal native to Southern Africa with a stripe down its side | Synonyms: Canis adustus, side-striped jackal |
| (noun) a canid living in the deserts of Northern Africa related to the goldn jackal and the grey wolf | Synonyms: African golden wolf, Canis anthus, Egyptian jackal, grey jackal |
| jail | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jailhouse, pokey, poky, slammer |
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| jarful | (noun) the quantity contained in a jar | Synonyms: jar |
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| jellyroll | (noun) thin sheet of sponge cake spread with jelly and then rolled up to make a cylindrical cake | Synonyms: Swiss roll |
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| jewel | (noun) a precious or semiprecious stone incorporated into a piece of jewelry | Synonyms: gem, precious stone |
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| (noun) a person who is as brilliant and precious as a piece of jewelry | Synonyms: gem |
| jezebel | (noun) a shameless impudent scheming woman | - |
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| jonquil | (noun) widely cultivated ornamental plant native to southern Europe but naturalized elsewhere having fragrant yellow or white clustered flowers | Synonyms: Narcissus jonquilla |
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| (noun) often used colloquially for any yellow daffodil | - |
| journal | (noun) the part of the axle contained by a bearing | - |
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| (noun) a record book as a physical object | - |
| (noun) a periodical dedicated to a particular subject | - |
| (noun) a daily written record of (usually personal) experiences and observations | Synonyms: diary |
| (noun) a ledger in which transactions have been recorded as they occurred | Synonyms: daybook |
| jowl | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jawbone, lower jaw, lower jawbone, mandible, mandibula, mandibular bone, submaxilla |
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| (noun) a fullness and looseness of the flesh of the lower cheek and jaw (characteristic of aging) | - |
| jugful | (noun) the quantity contained in a jug | Synonyms: jug |
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| jumbal | (noun) small flat ring-shaped cake or cookie | Synonyms: jumble |
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| kail | (noun) coarse curly-leafed cabbage | Synonyms: cole, kale |
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| (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, cole, colewort, kale |
| kanchil | (noun) small chevrotain of southeastern Asia | Synonyms: Tragulus kanchil |
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| karakul | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: broadtail, caracul |
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| keel | (noun) one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability | - |
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| (noun) the median ridge on the breastbone of birds that fly | - |
| (noun) a projection or ridge that suggests a keel | - |
| kegful | (noun) the quantity contained in a keg | Synonyms: keg |
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| kennel | (noun) outbuilding that serves as a shelter for a dog | Synonyms: dog house, doghouse |
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| kernel | (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, core, essence, gist, heart, heart and soul, inwardness, marrow, meat, nitty-gritty, nub, pith, substance, sum |
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| (noun) a single whole grain of a cereal | - |
| (noun) the inner and usually edible part of a seed or grain or nut or fruit stone | Synonyms: meat |
| 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 |
| kettleful | (noun) the quantity a kettle will hold | Synonyms: kettle |
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| kill | (noun) the act of terminating a life | Synonyms: killing, putting to death |
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| (noun) the destruction of an enemy plane or ship or tank or missile | - |
| (noun) the body of an animal, or bodies of animals, killed by a person or another animal | - |
| kindjal | (noun) a kind of short sword or dagger with a slightly curved blade, probably originated in Chechnya. | - |
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| kittul | (noun) fishtail palm of India to Malay Peninsula; sap yields a brown sugar (jaggery) and trunk pith yields sago | Synonyms: Caryota urens, jaggery palm, kitul, kitul tree, toddy palm, wine palm |
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| kitul | (noun) fishtail palm of India to Malay Peninsula; sap yields a brown sugar (jaggery) and trunk pith yields sago | Synonyms: Caryota urens, jaggery palm, kittul, kitul tree, toddy palm, wine palm |
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| knawel | (noun) widely distributed low-growing Eurasian herb having narrow leaves and inconspicuous green flowers | Synonyms: knawe, Scleranthus annuus |
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| kneel | (noun) supporting yourself on your knees | Synonyms: kneeling |
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| knell | (noun) the sound of a bell rung slowly to announce a death or a funeral or the end of something | - |
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| knoll | (noun) a small natural hill | Synonyms: hammock, hillock, hummock, mound |
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| knuckleball | (noun) a baseball pitch thrown with little speed or spin | Synonyms: knuckler |
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| kohl | (noun) a cosmetic preparation used by women in Egypt and Arabia to darken the edges of their eyelids | - |
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| kraal | (noun) a pen for livestock in southern Africa | - |
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| (noun) a village of huts for native Africans in southern Africa; usually surrounded by a stockade | - |
| krill | (noun) shrimp-like planktonic crustaceans; major source of food for e.g. baleen whales | - |
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| kummel | (noun) liqueur flavored with caraway seed or cumin | - |
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| l | (noun) the 12th letter of the Roman alphabet | Synonyms: L |
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| (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, liter, litre |
| label | (noun) an identifying or descriptive marker that is attached to an object | - |
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| (noun) a brief description given for purposes of identification | - |
| (noun) trade name of a company that produces musical recordings | Synonyms: recording label |
| (noun) a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction | - |
| labetalol | (noun) antihypertensive drug (trade names Trandate and Normodyne) that blocks alpha and beta-adrenergic receptors of the sympathetic nervous system (leading to a decrease in blood pressure) | Synonyms: labetalol hydrochloride, Normodyne, Trandate |
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| labial | (noun) a consonant whose articulation involves movement of the lips | Synonyms: labial consonant |
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| labiodental | (noun) a consonant whose articulation involves the lips and teeth | Synonyms: labiodental consonant |
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| lacteal | (noun) any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct | - |
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| lambkill | (noun) North American dwarf shrub resembling mountain laurel but having narrower leaves and small red flowers; poisonous to young stock | Synonyms: Kalmia angustifolia, pig laurel, sheep laurel |
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| lampshell | (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: brachiopod, lamp shell |
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| landfall | (noun) the first sighting of land from the sea after a voyage (or flight over water) | - |
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| (noun) the seacoast first sighted on a voyage (or flight over water) | - |
| landfill | (noun) a low area that has been filled in | - |
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| lapel | (noun) lap at the front of a coat; continuation of the coat collar | - |
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| lapful | (noun) the quantity that can be held in the lap | - |
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| lateral | (noun) a pass to a receiver upfield from the passer | Synonyms: lateral pass |
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| laurel | (noun) (antiquity) a wreath of laurel foliage worn on the head as an emblem of victory | Synonyms: bay wreath, laurel wreath |
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| (noun) any of various aromatic trees of the laurel family | - |
| lenticel | (noun) one of many raised pores on the stems of woody plants that allow the interchange of gas between the atmosphere and the interior tissue | - |
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| lentil | (noun) round flat seed of the lentil plant used for food | - |
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| (noun) widely cultivated Eurasian annual herb grown for its edible flattened seeds that are cooked like peas and also ground into meal and for its leafy stalks that are used as fodder | Synonyms: Lens culinaris, lentil plant |
| (noun) the fruit or seed of a lentil plant | - |
| level | (noun) indicator that establishes the horizontal when a bubble is centered in a tube of liquid | Synonyms: spirit level |
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| (noun) a structure consisting of a room or set of rooms at a single position along a vertical scale | Synonyms: floor, storey, story |
| (noun) a flat surface at right angles to a plumb line | Synonyms: horizontal surface |
| (noun) a position on a scale of intensity or amount or quality | Synonyms: degree, grade |
| (noun) height above ground | - |
| (noun) an abstract place usually conceived as having depth | Synonyms: layer, stratum |
| (noun) a specific identifiable position in a continuum or series or especially in a process | Synonyms: degree, point, stage |
| (noun) a relative position or degree of value in a graded group | Synonyms: grade, tier |
| libel | (noun) a false and malicious publication printed for the purpose of defaming a living person | - |
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| (noun) the written statement of a plaintiff explaining the cause of action (the defamation) and any relief he seeks | - |
| liberal | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberalist, progressive |
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| (noun) a person who favors an economic theory of laissez-faire and self-regulating markets | - |
| linalool | (noun) a colorless fragrant liquid found in many essential oils | - |
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| lingual | (noun) a consonant that is produced with the tongue and other speech organs | - |
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| lintel | (noun) horizontal beam used as a finishing piece over a door or window | Synonyms: header |
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| lisinopril | (noun) an ACE inhibiting drug (trade names Prinivil or Zestril) administered as an antihypertensive and after heart attacks | Synonyms: Prinivil, Zestril |
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| literal | (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: erratum, literal error, misprint, typo, typographical error |
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| litoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: littoral, littoral zone, sands |
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| littoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: litoral, littoral zone, sands |
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| local | (noun) public transport consisting of a bus or train that stops at all stations or stops | - |
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| (noun) anesthetic that numbs a particular area of the body | Synonyms: local anaesthetic, local anesthetic, topical anaesthetic, topical anesthetic |
| longwool | (noun) a domestic long-wool sheep | - |
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| lorchel | (noun) a large fungus of the family Helvellaceae | - |
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| lugsail | (noun) a sail with four corners that is hoisted from a yard that is oblique to the mast | Synonyms: lug |
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| lull | (noun) a period of calm weather | Synonyms: quiet |
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| (noun) a pause during which things are calm or activities are diminished | Synonyms: letup |
| lumbermill | (noun) a mill for dressing logs and lumber | Synonyms: sawmill |
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| mackerel | (noun) any of various fishes of the family Scombridae | - |
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| (noun) flesh of very important usually small (to 18 in) fatty Atlantic fish | - |
| madrigal | (noun) an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form | - |
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| mail | (noun) (Middle Ages) flexible armor made of interlinked metal rings | Synonyms: chain armor, chain armour, chain mail, ring armor, ring armour, ring mail |
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| (noun) a conveyance that transports the letters and packages that are conveyed by the postal system | - |
| (noun) the system whereby messages are transmitted via the post office | Synonyms: mail service, post, postal service |
| (noun) the bags of letters and packages that are transported by the postal service | - |
| (noun) any particular collection of letters or packages that is delivered | Synonyms: post |
| mainsail | (noun) the lowermost sail on the mainmast | - |
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| mall | (noun) a public area set aside as a pedestrian walk | Synonyms: promenade |
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| (noun) mercantile establishment consisting of a carefully landscaped complex of shops representing leading merchandisers; usually includes restaurants and a convenient parking area; a modern version of the traditional marketplace | Synonyms: center, centre, plaza, shopping center, shopping centre, shopping mall |
| mammal | (noun) any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk | Synonyms: mammalian |
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| mandrel | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandril, spindle |
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| mandril | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandrel, spindle |
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| mandrill | (noun) baboon of west Africa with a bright red and blue muzzle and blue hindquarters | Synonyms: Mandrillus sphinx |
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| mangonel | (noun) catapult operated by manpower pulling cords attached to a lever and slign to launch projectiles | Synonyms: bricole, traction trebuchet |
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| mannitol | (noun) a diuretic (trade name Osmitrol) used to promote the excretion of urine | Synonyms: Osmitrol |
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| mantel | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantelpiece, mantle, mantlepiece |
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| manual | (noun) (military) a prescribed drill in handling a rifle | Synonyms: manual of arms |
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| (noun) a small handbook | - |
| manul | (noun) small wildcat of the mountains of Siberia and Tibet and Mongolia | Synonyms: Felis manul, Pallas's cat |
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| marcel | (noun) a hairdo characterized by deep regular waves that are made by a heated curling iron | - |
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| marl | (noun) a loose and crumbling earthy deposit consisting mainly of calcite or dolomite; used as a fertilizer for soils deficient in lime | - |
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| marshal | (noun) a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law | Synonyms: marshall |
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| (noun) (in some countries) a military officer of highest rank | Synonyms: marshall |
| marshall | (noun) a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law | Synonyms: marshal |
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| (noun) (in some countries) a military officer of highest rank | Synonyms: marshal |
| marsupial | (noun) mammals of which the females have a pouch (the marsupium) containing the teats where the young are fed and carried | Synonyms: pouched mammal |
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| marvel | (noun) something that causes feelings of wonder | Synonyms: wonder |
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| mastoidal | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid, mastoid bone, mastoid process |
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| material | (noun) artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers | Synonyms: cloth, fabric, textile |
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| (noun) things needed for doing or making something | - |
| (noun) information (data or ideas or observations) that can be used or reworked into a finished form | - |
| (noun) a person judged suitable for admission or employment | - |
| (noun) the tangible substance that goes into the makeup of a physical object | Synonyms: stuff |
| materiel | (noun) equipment and supplies of a military force | Synonyms: equipage |
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| maul | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: sledge, sledgehammer |
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| maxwell | (noun) a cgs unit of magnetic flux equal to the flux perpendicular to an area of 1 square centimeter in a magnetic field of 1 gauss | Synonyms: Mx |
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| meal | (noun) the food served and eaten at one time | Synonyms: repast |
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| (noun) coarsely ground foodstuff; especially seeds of various cereal grasses or pulse | - |
| (noun) any of the occasions for eating food that occur by custom or habit at more or less fixed times | - |
| meatball | (noun) ground meat formed into a ball and fried or simmered in broth | - |
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