| jerkin | (noun) a tight sleeveless and collarless jacket (often made of leather) worn by men in former times | - |
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| join | (noun) a set containing all and only the members of two or more given sets | Synonyms: sum, union |
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| (noun) the shape or manner in which things come together and a connection is made | Synonyms: articulation, joint, junction, juncture |
| kanamycin | (noun) antibiotic (trade name Kantrex) used to treat severe infections | Synonyms: Kantrex |
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| kaolin | (noun) a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper) | Synonyms: china clay, china stone, kaoline, porcelain clay, terra alba |
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| kelvin | (noun) the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites | Synonyms: K |
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| keratin | (noun) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves | Synonyms: ceratin |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| khamsin | (noun) an oppressively hot southerly wind from the Sahara that blows across Egypt in the spring | - |
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| kidskin | (noun) soft smooth leather from the hide of a young goat | Synonyms: kid |
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| kilderkin | (noun) an obsolete British unit of capacity equal to 18 Imperial gallons | - |
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| kin | (noun) group of people related by blood or marriage | Synonyms: clan, kin group, kindred, kinship group, tribe |
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| (noun) a person having kinship with another or others | Synonyms: family, kinsperson |
| kingpin | (noun) bolt that provides a steering joint in a motor vehicle | Synonyms: kingbolt, swivel pin |
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| (noun) the front bowling pin in the triangular arrangement of ten pins | Synonyms: headpin |
| (noun) the most important person in a group or undertaking | Synonyms: bigwig, top banana |
| kinin | (noun) any of a class of plant hormones that promote cell division and delay the senescence of leaves | Synonyms: cytokinin |
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| kremlin | (noun) citadel of a Russian town | - |
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| lactalbumin | (noun) albumin occurring in milk | - |
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| lactoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| lactoglobulin | (noun) a globular protein found in milk. | - |
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| lambkin | (noun) a very young lamb | - |
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| lambrequin | (noun) short and decorative hanging for a shelf edge or top of a window casing | - |
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| (noun) a scarf that covers a knight's helmet | - |
| lambskin | (noun) the skin of a lamb with the wool still on | - |
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| (noun) skin of a sheep or goat prepared for writing on | Synonyms: parchment, sheepskin |
| lanolin | (noun) an emollient containing wool fat (a fatty substance obtained from the wool of sheep) | - |
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| (noun) a yellow viscous animal oil extracted from wool; a mixture of fatty acids and esters; used in some ointments and cosmetics | Synonyms: wool fat, wool grease |
| lapin | (noun) castrated male rabbit | - |
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| (noun) the fur of a rabbit | Synonyms: rabbit |
| lecithin | (noun) a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier | - |
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| lectin | (noun) any of several plant glycoproteins that act like specific antibodies but are not antibodies in that they are not evoked by an antigenic stimulus | - |
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| legerdemain | (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, deception, illusion, magic, magic trick, thaumaturgy, trick |
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| lemanderin | (noun) hybrid between mandarin orange and lemon having very acid fruit with orange peel | Synonyms: Citrus limonia, rangpur, rangpur lime |
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| lignin | (noun) a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants | - |
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| limpkin | (noun) wading bird of Florida, Cuba and Jamaica having a drooping bill and a distinctive wailing call | Synonyms: Aramus pictus |
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| linchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: lynchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, lynchpin, mainstay |
| lincomycin | (noun) antibiotic (trade name Lincocin) obtained from a streptomyces bacterium and used in the treatment of certain penicillin-resistant infections | Synonyms: Lincocin |
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| linin | (noun) an obsolete term for the network of viscous material in the cell nucleus on which the chromatin granules were thought to be suspended | - |
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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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| litterbin | (noun) bin (usually in or outside a public building) into which the public can put rubbish | Synonyms: litter-basket, litter basket |
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| lobefin | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: crossopterygian, lobe-finned fish |
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| loin | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: lumbus |
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| (noun) a cut of meat taken from the side and back of an animal between the ribs and the rump | - |
| lovastatin | (noun) an oral drug (trade name Mevacor) to reduce blood cholesterol levels; used when dietary changes have proved inadequate | Synonyms: Mevacor |
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| luciferin | (noun) pigment occurring in luminescent organisms (as fireflies); emits heatless light when undergoing oxidation | - |
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| lupin | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupine |
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| lupulin | (noun) Lupulin is a powder separated from the strobiles of common hop. | - |
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| lutein | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: xanthophyl, xanthophyll |
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| 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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| lynchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: linchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, linchpin, mainstay |
| lypressin | (noun) an antidiuretic and vasoconstrictor used to treat diabetes insipidus | - |
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| lysin | (noun) any substance (such as an antibody) or agent that can cause lysis | - |
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| main | (noun) a principal pipe in a system that distributes water or gas or electricity or that collects sewage | - |
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| (noun) any very large body of (salt) water | Synonyms: briny |
| manakin | (noun) any of numerous small bright-colored birds of Central America and South America having short bills and elaborate courtship behavior | - |
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| (noun) a life-size dummy used to display clothes | Synonyms: form, manikin, mannequin, mannikin |
| (noun) a woman who wears clothes to display fashions | Synonyms: fashion model, manikin, mannequin, mannikin, model |
| mandarin | (noun) a somewhat flat reddish-orange loose skinned citrus of China | Synonyms: mandarin orange |
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| (noun) a high public official of imperial China | - |
| (noun) any high government official or bureaucrat | - |
| (noun) a member of an elite intellectual or cultural group | - |
| (noun) shrub or small tree having flattened globose fruit with very sweet aromatic pulp and thin yellow-orange to flame-orange rind that is loose and easily removed; native to southeastern Asia | Synonyms: Citrus reticulata, mandarin orange, mandarin orange tree |
| mandolin | (noun) a stringed instrument related to the lute, usually played with a plectrum | - |
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| manikin | (noun) a life-size dummy used to display clothes | Synonyms: form, manakin, mannequin, mannikin |
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| (noun) a person who is very small but who is not otherwise deformed or abnormal | Synonyms: homunculus, mannikin |
| (noun) a woman who wears clothes to display fashions | Synonyms: fashion model, manakin, mannequin, mannikin, model |
| mannequin | (noun) a life-size dummy used to display clothes | Synonyms: form, manakin, manikin, mannikin |
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| (noun) a woman who wears clothes to display fashions | Synonyms: fashion model, manakin, manikin, mannikin, model |
| mannikin | (noun) a life-size dummy used to display clothes | Synonyms: form, manakin, manikin, mannequin |
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| (noun) a person who is very small but who is not otherwise deformed or abnormal | Synonyms: homunculus, manikin |
| (noun) a woman who wears clothes to display fashions | Synonyms: fashion model, manakin, manikin, mannequin, model |
| margarin | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarine, marge, oleo, oleomargarine |
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| (noun) a glyceryl ester of margaric acid | Synonyms: glycerol trimargarate |
| margin | (noun) an amount beyond the minimum necessary | - |
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| (noun) a permissible difference; allowing some freedom to move within limits | Synonyms: allowance, leeway, tolerance |
| (noun) the blank space that surrounds the text on a page | - |
| (noun) the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities | Synonyms: security deposit |
| (noun) (finance) the net sales minus the cost of goods and services sold | Synonyms: gross profit, gross profit margin |
| (noun) the boundary line or the area immediately inside the boundary | Synonyms: border, perimeter |
| marlin | (noun) large long-jawed oceanic sport fishes; related to sailfishes and spearfishes; not completely cold-blooded i.e. able to warm their brains and eyes | - |
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| marocain | (noun) a dress crepe; similar to Canton crepe | Synonyms: crepe marocain |
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| martin | (noun) any of various swallows with squarish or slightly forked tail and long pointed wings; migrate around Martinmas | - |
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| matrikin | (noun) one related on the mother's side | Synonyms: enate, matrilineal kin, matrilineal sib, matrisib |
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| mavin | (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, adept, champion, genius, hotshot, maven, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
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| melanin | (noun) insoluble pigments that account for the color of e.g. skin and scales and feathers | - |
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| melatonin | (noun) hormone secreted by the pineal gland | - |
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| mephenytoin | (noun) a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective | Synonyms: Mesantoin |
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| merlin | (noun) small falcon of Europe and America having dark plumage with black-barred tail; used in falconry | Synonyms: Falco columbarius, pigeon hawk |
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| metformin | (noun) an antidiabetic drug (trade name Glucophage) prescribed to treat type II diabetes | Synonyms: Glucophage |
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| metheglin | (noun) spiced or medicated mead | - |
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| methicillin | (noun) antibiotic drug of the penicillin family used in the treatment of certain staphylococcal infections | - |
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| midbrain | (noun) the middle portion of the brain | Synonyms: mesencephalon |
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| midvein | (noun) the vein in the center of a leaf | Synonyms: midrib |
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| min | (noun) a unit of time equal to 60 seconds or 1/60th of an hour | Synonyms: minute |
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| mithramycin | (noun) an antineoplastic drug (trade name Mithracin) used to treat cancer of the testes | Synonyms: Mithracin |
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| mitomycin | (noun) a complex of antibiotic substances obtained from a streptomyces bacterium; one form (trade name Mutamycin) shows promise as an anticancer drug | Synonyms: Mutamycin |
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| mocassin | (noun) soft leather shoe; originally worn by Native Americans | Synonyms: moccasin |
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| moccasin | (noun) soft leather shoe; originally worn by Native Americans | Synonyms: mocassin |
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| moleskin | (noun) a durable cotton fabric with a velvety nap | - |
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| mombin | (noun) purplish tropical fruit | - |
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| (noun) common tropical American shrub or small tree with purplish fruit | Synonyms: jocote, mombin tree, Spondias purpurea |
| mortmain | (noun) the oppressive influence of past events or decisions | Synonyms: dead hand, dead hand of the past |
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| (noun) real property held inalienably (as by an ecclesiastical corporation) | Synonyms: dead hand |
| motilin | (noun) a gastrointestinal hormone that apparently participates in controlling smooth muscle contractions in the stomach and small intestine | - |
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| moulin | (noun) a chute through which supraglacial water enters a glacier, boring either to the bedrock or to the depth of common crevasse formation | Synonyms: glacier mill |
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| mountain | (noun) a land mass that projects well above its surroundings; higher than a hill | Synonyms: mount |
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| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| muadhdhin | (noun) the Muslim official of a mosque who summons the faithful to prayer from a minaret five times a day | Synonyms: muazzin, muezzin |
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| muazzin | (noun) the Muslim official of a mosque who summons the faithful to prayer from a minaret five times a day | Synonyms: muadhdhin, muezzin |
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| mucin | (noun) a nitrogenous substance found in mucous secretions; a lubricant that protects body surfaces | - |
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| muezzin | (noun) the Muslim official of a mosque who summons the faithful to prayer from a minaret five times a day | Synonyms: muadhdhin, muazzin |
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| muffin | (noun) a sweet quick bread baked in a cup-shaped pan | Synonyms: gem |
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| mujahadein | (noun) a military force of Muslim guerilla warriors engaged in a jihad | Synonyms: mujahadeen, mujahadin, mujahedeen, mujahedin, mujahideen, mujahidin |
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| mujahadin | (noun) a military force of Muslim guerilla warriors engaged in a jihad | Synonyms: mujahadeen, mujahadein, mujahedeen, mujahedin, mujahideen, mujahidin |
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| mujahedin | (noun) a military force of Muslim guerilla warriors engaged in a jihad | Synonyms: mujahadeen, mujahadein, mujahadin, mujahedeen, mujahideen, mujahidin |
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| mujahidin | (noun) a military force of Muslim guerilla warriors engaged in a jihad | Synonyms: mujahadeen, mujahadein, mujahadin, mujahedeen, mujahedin, mujahideen |
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| mullein | (noun) any of various plants of the genus Verbascum having large usually woolly leaves and terminal spikes of yellow or white or purplish flowers | Synonyms: flannel leaf, velvet plant |
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| multivitamin | (noun) a pill or tablet containing several vitamins | Synonyms: multivitamin pill |
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| murrain | (noun) any disease of domestic animals that resembles a plague | - |
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| muslin | (noun) plain-woven cotton fabric | - |
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| mutchkin | (noun) a Scottish unit of liquid measure equal to 0.9 United States pint | - |
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| mycomycin | (noun) a highly unsaturated antibiotic acid obtained from an actinomycete | - |
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| mycotoxin | (noun) a toxin produced by a fungus | - |
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| myelin | (noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers | Synonyms: medulla, myeline |
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| myoglobin | (noun) a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed | - |
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| myosin | (noun) the commonest protein in muscle; a globulin that combines with actin to form actomyosin | - |
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| nafcillin | (noun) a penicillinase-resistant form of penicillin (trade name Nafcil) used (usually in the form of its sodium salt) to treat infections caused by penicillin-resistant strains of staphylococci | Synonyms: Nafcil |
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| napkin | (noun) a small piece of table linen that is used to wipe the mouth and to cover the lap in order to protect clothing | Synonyms: serviette, table napkin |
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| (noun) garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement | Synonyms: diaper, nappy |
| neomycin | (noun) an antibiotic obtained from an actinomycete and used (as a sulphate under the trade name Neobiotic) as an intestinal antiseptic in surgery | Synonyms: fradicin, Neobiotic |
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