| idiotically | (adverb) in an idiotic manner | - |
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| immotile | (adjective) (of spores or microorganisms) not capable of movement | Synonyms: nonmotile |
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| immotility | (noun) lacking an ability to move | - |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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| immunotherapy | (noun) therapy designed to produce immunity to a disease or to enhance resistance by the immune system | - |
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| impotence | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotency, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotency |
| impotency | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotence, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotence |
| impotent | (adjective) lacking power or ability | - |
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| (adjective) (of a male) unable to copulate | - |
| impotently | (adverb) in a helpless manner | Synonyms: helplessly |
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| indigotin | (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigo |
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| infotainment | (noun) a film or TV program presenting the facts about a person or event | Synonyms: docudrama, documentary, documentary film |
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| ingot | (noun) metal that is cast in the shape of a block for convenient handling | - |
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| inkblot | (noun) a blot made with ink | - |
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| inkpot | (noun) a bottle of ink | Synonyms: ink bottle |
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| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| iontotherapy | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontophoresis |
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| iota | (noun) the 9th letter of the Greek alphabet | - |
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| (noun) a tiny or scarcely detectable amount | Synonyms: scintilla, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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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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| isosmotic | (adjective) (used of solutions) having the same or equal osmotic pressure | Synonyms: isotonic |
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| isotach | (noun) a line joining points with constant wind speed. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| isothermic | (adjective) of or relating to an isotherm | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| isotonic | (adjective) (used of solutions) having the same or equal osmotic pressure | Synonyms: isosmotic |
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| (adjective) of or involving muscular contraction in which tension is constant while length changes | - |
| (adjective) relating to or characterized by the equal intervals of a musical scale | - |
| (adjective) of two or more muscles; having equal tension | - |
| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| isotopic | (adjective) of or relating to or having the relation of an isotope | - |
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| isotropic | (adjective) invariant with respect to direction | Synonyms: isotropous |
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| isotropically | (adverb) in an isotropic manner | - |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| jabot | (noun) a ruffle on the front of a woman's blouse or a man's shirt | - |
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| jaboticaba | (noun) tough-skinned purple grapelike tropical fruit grown in Brazil | - |
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| (noun) small evergreen tropical tree native to Brazil and West Indies but introduced into southern United States; grown in Brazil for its edible tough-skinned purple grapelike fruit that grows all along the branches | Synonyms: jaboticaba tree, Myrciaria cauliflora |
| jackboot | (noun) (19th century) a man's high tasseled boot | Synonyms: hessian, Hessian boot, Wellington, Wellington boot |
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| jackpot | (noun) the cumulative amount involved in a game (such as poker) | Synonyms: kitty, pot |
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| (noun) any outstanding award | - |
| jampot | (noun) a jar for holding jellies or preserves | Synonyms: jamjar |
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| jocote | (noun) common tropical American shrub or small tree with purplish fruit | Synonyms: mombin, mombin tree, Spondias purpurea |
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| jot | (noun) a brief (and hurriedly handwritten) note | Synonyms: jotting |
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| (noun) a slight but appreciable amount | Synonyms: hint, mite, pinch, soupcon, speck, tinge, touch |
| (verb) write briefly or hurriedly; write a short note of | Synonyms: jot down |
| jotter | (noun) a small notebook for rough notes | - |
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| jotting | (noun) a brief (and hurriedly handwritten) note | Synonyms: jot |
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| karyotype | (noun) the appearance of the chromosomal makeup of a somatic cell in an individual or species (including the number and arrangement and size and structure of the chromosomes) | - |
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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| 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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| keynote | (noun) a fundamental or central idea | - |
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| (noun) (music) the first note of a diatonic scale | Synonyms: tonic |
| (noun) the principal theme in a speech or literary work | - |
| (verb) set the keynote of | - |
| (verb) give the keynote address to (an audience) | - |
| kiloton | (noun) one thousand tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of 1000 tons of TNT | - |
| knot | (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, grayback, greyback |
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| (noun) any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object | - |
| (noun) soft lump or unevenness in a yarn; either an imperfection or created by design | Synonyms: burl, slub |
| (noun) a tight cluster of people or things | - |
| (noun) something twisted and tight and swollen | Synonyms: gnarl |
| (noun) a hard cross-grained round piece of wood in a board where a branch emerged | - |
| (noun) (of ships and wind) a unit of speed equal to one nautical mile per hour or about 1.15 statute miles per hour | - |
| (verb) tie or fasten into a knot | - |
| (verb) tangle or complicate | Synonyms: ravel, tangle |
| (verb) make into knots; make knots out of | - |
| knotgrass | (noun) low-growing weedy grass with spikelets along the leaf stems | Synonyms: Paspalum distichum |
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| knothole | (noun) a hole in a board where a knot came out | - |
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| knotted | (adjective) used of old persons or old trees; covered with knobs or knots | Synonyms: gnarled, gnarly, knobbed, knotty |
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| (adjective) tied with a knot | - |
| knottiness | (noun) puzzling complexity | Synonyms: complicatedness, complication, tortuousness |
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| knotty | (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, involved, labyrinthine, tangled, tortuous |
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| (adjective) used of old persons or old trees; covered with knobs or knots | Synonyms: gnarled, gnarly, knobbed, knotted |
| (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, elusive, problematic, problematical, tough |
| (adjective) tangled in knots or snarls | Synonyms: snarled, snarly |
| koto | (noun) Japanese stringed instrument that resembles a zither; has a rectangular wooden sounding board and usually 13 silk strings that are plucked with the fingers | - |
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| kotow | (noun) a former Chinese custom of touching the ground with the forehead as a sign of respect or submission | Synonyms: kowtow |
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| (verb) try to gain favor by cringing or flattering | Synonyms: bootlick, fawn, kowtow, suck up, toady, truckle |
| kyphotic | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, gibbous, humpbacked, humped, hunchbacked |
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| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
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| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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| leitmotif | (noun) a melodic phrase that accompanies the reappearance of a person or situation (as in Wagner's operas) | Synonyms: leitmotiv |
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| leitmotiv | (noun) a melodic phrase that accompanies the reappearance of a person or situation (as in Wagner's operas) | Synonyms: leitmotif |
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| leotard | (noun) a tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance | Synonyms: body suit, cat suit, unitard |
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| leotards | (noun) skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls | Synonyms: tights |
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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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| lepidote | (adjective) rough to the touch; covered with scales or scurf | Synonyms: leprose, scabrous, scaly, scurfy |
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| lepiota | (noun) any fungus of the genus Lepiota | - |
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| leptotene | (noun) the first stage of the prophase of meiosis | - |
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| lerot | (noun) dormouse of southern Europe and northern Africa | - |
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| leucothoe | (noun) any plant of the genus Leucothoe; grown for their beautiful white flowers; glossy foliage contains a poisonous substance similar to that found in genus Kalmia | - |
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| leucotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leukotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| leukotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| levorotary | (adjective) rotating to the left | Synonyms: left-handed, levorotatory |
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| levorotation | (noun) rotation to the left | Synonyms: counterclockwise rotation |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| lipoprotein | (noun) a conjugated protein having a lipid component; the principal means for transporting lipids in the blood | - |
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| lipotropic | (adjective) having an affinity for lipids | Synonyms: lipophilic |
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| lithotomy | (noun) surgical removal of a stone (calculus) | - |
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| litotes | (noun) understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary) | Synonyms: meiosis |
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| lobotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, leukotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| locomote | (verb) change location; move, travel, or proceed, also metaphorically | Synonyms: go, move, travel |
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| locomotion | (noun) self-propelled movement | Synonyms: travel |
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| (noun) the power or ability to move | Synonyms: motive power, motivity |
| locomotive | (adjective) of or relating to locomotion | Synonyms: locomotor |
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| (noun) a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks | Synonyms: engine, locomotive engine, railway locomotive |
| locomotor | (adjective) of or relating to locomotion | Synonyms: locomotive |
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| logotype | (noun) a company emblem or device | Synonyms: logo |
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| loincloth | (noun) a garment that provides covering for the loins | Synonyms: breechcloth, breechclout |
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| longroot | (noun) deep-rooted perennial of southeastern United States | Synonyms: Arenaria caroliniana, pine-barren sandwort |
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| longshot | (noun) a photograph taken from a distance | - |
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| loot | (noun) goods or money obtained illegally | Synonyms: booty, dirty money, pillage, plunder, prize, swag |
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| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, kale, lettuce, lolly, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| (verb) steal goods; take as spoils | Synonyms: despoil, foray, pillage, plunder, ransack, reave, rifle, strip |
| (verb) take illegally; of intellectual property | Synonyms: plunder |
| looted | (adjective) wrongfully emptied or stripped of anything of value | Synonyms: pillaged, plundered, ransacked |
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| looter | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, pillager, plunderer, raider, spoiler |
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| looting | (noun) plundering during riots or in wartime | Synonyms: robbery |
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| lordotic | (adjective) having abnormal sagging of the spine (especially in horses) | Synonyms: dipped, swayback, swaybacked |
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| lot | (noun) anything (straws or pebbles etc.) taken or chosen at random | Synonyms: draw |
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| (noun) an unofficial association of people or groups | Synonyms: band, circle, set |
| (noun) any collection in its entirety | Synonyms: bunch, caboodle |
| (noun) a parcel of land having fixed boundaries | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: circumstances, destiny, fate, fortune, luck, portion |
| (verb) administer or bestow, as in small portions | Synonyms: administer, allot, deal, deal out, dish out, dispense, distribute, dole out, mete out, parcel out, shell out |
| (verb) divide into lots, as of land, for example | - |
| lota | (noun) a globular water bottle used in Asia | - |
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| loth | (adjective) (usually followed by `to') strongly opposed | Synonyms: antipathetic, antipathetical, averse, indisposed, loath |
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| (adjective) unwillingness to do something contrary to your custom | Synonyms: loath, reluctant |