| hemolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrocytolysin, erythrolysin, haemolysin |
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| hemoprotein | (noun) a conjugated protein linked to a compound of iron and porphyrin | Synonyms: haemoprotein |
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| hemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: haemosiderin |
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| heparin | (noun) a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery | Synonyms: Lipo-Hepin, Liquaemin |
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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| herein | (adverb) in this place or thing or document | - |
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| heroin | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: diacetylmorphine |
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| hifalutin | (adjective) affectedly genteel; to carry an air of affected importance; to be snobbish and haughty | Synonyms: grandiose, highfalutin, highfaluting, hoity-toity, la-di-da |
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| highfalutin | (adjective) affectedly genteel; to carry an air of affected importance; to be snobbish and haughty | Synonyms: grandiose, hifalutin, highfaluting, hoity-toity, la-di-da |
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| hin | (noun) ancient Hebrew unit of liquid measure = 1.5 gallons | - |
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| hindbrain | (noun) the posterior portion of the brain including cerebellum and brainstem | Synonyms: rhombencephalon |
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| hoactzin | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoatzin, Opisthocomus hoazin, stinkbird |
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| hoatzin | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoactzin, Opisthocomus hoazin, stinkbird |
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| hobgoblin | (noun) an object of dread or apprehension | Synonyms: bugbear |
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| (noun) (folklore) a small grotesque supernatural creature that makes trouble for human beings | Synonyms: goblin, hob |
| humin | (noun) a black humic substance that is not soluble in water | - |
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| hyalin | (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyaline |
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| hydantoin | (noun) any of a group of anticonvulsant drugs used in treating epilepsy | - |
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| immunoglobulin | (noun) a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response | Synonyms: Ig, immune gamma globulin, immune globulin, immune serum globulin |
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| in | (adjective) currently fashionable | - |
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| (adjective) directed or bound inward | - |
| (adjective) holding office | - |
| (noun) a unit of length equal to one twelfth of a foot | Synonyms: inch |
| (adverb) to or toward the inside of | Synonyms: inward, inwards |
| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| indigotin | (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigo |
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| indomethacin | (noun) a nonsteroidal anti-inflammatory drug (trade name Indocin) | Synonyms: Indocin |
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| ingrain | (verb) produce or try to produce a vivid impression of | Synonyms: impress, instill |
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| (verb) thoroughly work in | Synonyms: grain |
| insulin | (noun) hormone secreted by the isles of Langerhans in the pancreas; regulates storage of glycogen in the liver and accelerates oxidation of sugar in cells | - |
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| interbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, thalmencephalon |
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| interleukin | (noun) any of several lymphokines that promote macrophages and killer T cells and B cells and other components of the immune system | - |
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| inulin | (noun) used to manufacture fructose and in assessing kidney function | - |
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| iodin | (noun) a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) | Synonyms: atomic number 53, I, iodine |
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| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iodopsin | (noun) a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | - |
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| isoagglutinin | (noun) an antibody produced by one individual that causes agglutination of red blood cells in other individuals of the same species | - |
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| javelin | (noun) a spear thrown as a weapon or in competitive field events | - |
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| (noun) an athletic competition in which a javelin is thrown as far as possible | - |
| 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 |
| (verb) make contact or come together | Synonyms: conjoin |
| (verb) cause to become joined or linked | - |
| (verb) become part of; become a member of a group or organization | Synonyms: fall in, get together |
| (verb) come into the company of | - |
| (verb) be or become joined or united or linked | Synonyms: connect, link, link up, unite |
| 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 | (adjective) related by blood | Synonyms: akin, blood-related, cognate, consanguine, consanguineal, consanguineous |
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| (noun) group of people related by blood or marriage | Synonyms: clan, kin group, kindred, kinship group, tribe |
| (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 | (adjective) (of a clause) capable of standing syntactically alone as a complete sentence | Synonyms: independent |
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| (adjective) most important element | Synonyms: chief, master, primary, principal |
| (adjective) of force; of the greatest possible intensity | - |
| (noun) a principal pipe in a system that distributes water or gas or electricity or that collects sewage | - |
| (noun) any very large body of (salt) water | Synonyms: briny |
| maintain | (verb) stick to correctly or closely | Synonyms: keep, observe |
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| (verb) state categorically | Synonyms: assert, asseverate |
| (verb) state or assert | Synonyms: defend |
| (verb) support against an opponent | Synonyms: uphold |
| (verb) maintain by writing regular records | Synonyms: keep |
| (verb) supply with necessities and support | Synonyms: keep, sustain |
| (verb) keep in safety and protect from harm, decay, loss, or destruction | Synonyms: conserve, keep up, preserve |
| (verb) have and exercise | Synonyms: exert, wield |
| (verb) maintain for use and service | Synonyms: keep |
| (verb) cause to continue in a certain state, position, or activity | Synonyms: hold, keep |
| 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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| maudlin | (adjective) effusively or insincerely emotional | Synonyms: bathetic, drippy, hokey, kitschy, mawkish, mushy, sappy, schmaltzy, schmalzy, sentimental, slushy, soppy, soupy |
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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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