| isthmus | (noun) a cord-like tissue connecting two larger parts of an anatomical structure | Synonyms: band |
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| (noun) a relatively narrow strip of land (with water on both sides) connecting two larger land areas | - |
| jealous | (adjective) showing extreme cupidity; painfully desirous of another's advantages | Synonyms: covetous, envious |
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| (adjective) suspicious or unduly suspicious or fearful of being displaced by a rival | Synonyms: green-eyed, overjealous |
| joyous | (adjective) full of or characterized by joy | - |
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| judicious | (adjective) marked by the exercise of good judgment or common sense in practical matters | Synonyms: heady, wise |
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| jumentous | (adjective) smelling strongly like a beast of burden | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| kernicterus | (noun) an abnormal accumulation of bile pigment in the brain and other nerve tissue; causes yellow staining and tissue damage | - |
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| kurus | (noun) 100 kurus equal 1 lira in Turkey | Synonyms: piaster, piastre |
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| laborious | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, operose, punishing, toilsome |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| languorous | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languid |
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| larcenous | (noun) having a disposition to steal | Synonyms: thievishness |
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| laryngismus | (noun) laryngeal spasm caused by the sudden contraction of laryngeal muscles | - |
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| lascivious | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lewd, libidinous, lustful |
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| lecherous | (adjective) given to excessive indulgence in sexual activity | - |
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| leguminous | (adjective) relating to or consisting of legumes | - |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| lentiginous | (adjective) relating to or covered with or resembling freckles | Synonyms: freckled, lentiginose |
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| leprous | (adjective) relating to or resembling or having leprosy | - |
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| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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| libellous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libelous, slanderous |
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| libelous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, slanderous |
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| libidinous | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lascivious, lewd, lustful |
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| licentious | (adjective) lacking moral discipline; especially sexually unrestrained | - |
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| ligneous | (adjective) consisting of or containing lignin or xylem | - |
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| liliaceous | (adjective) of or pertaining to or characteristic of plants of the family Liliaceae | - |
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| limbus | (noun) a border or edge of any of various body parts distinguished by color or structure | - |
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| litigious | (adjective) of or relating to litigation | - |
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| (adjective) inclined or showing an inclination to dispute or disagree, even to engage in law suits | Synonyms: combative, contentious, disputatious, disputative |
| litmus | (noun) a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator | Synonyms: litmus test |
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| lobeliaceous | (adjective) belonging to the family Lobeliaceae | - |
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| loculus | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: locule |
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| locus | (noun) the set of all points or lines that satisfy or are determined by specific conditions | - |
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| (noun) the scene of any event or action (especially the place of a meeting) | Synonyms: locale, venue |
| (noun) the specific site of a particular gene on its chromosome | - |
| longanimous | (adjective) showing patient and unruffled self-control and restraint under adversity; slow to retaliate or express resentment | Synonyms: forbearing |
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| loquacious | (adjective) full of trivial conversation | Synonyms: chatty, gabby, garrulous, talkative, talky |
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| lotus | (noun) white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians | Synonyms: Egyptian water lily, Nymphaea lotus, white lily, white lotus |
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| (noun) native to eastern Asia; widely cultivated for its large pink or white flowers | Synonyms: Indian lotus, Nelumbo nucifera, sacred lotus |
| lubricious | (adjective) characterized by lust | Synonyms: lustful, prurient, salacious |
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| (adjective) having a smooth or slippery quality | - |
| lucifugous | (adjective) light-avoiding | Synonyms: lucifugal |
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| ludicrous | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, nonsensical, preposterous, ridiculous |
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| (adjective) broadly or extravagantly humorous; resembling farce | Synonyms: farcical, ridiculous |
| lugubrious | (adjective) excessively mournful | - |
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| lumbus | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: loin |
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| luminous | (adjective) softly bright or radiant | Synonyms: aglow, lambent, lucent |
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| lupus | (noun) any of several forms of ulcerative skin disease | - |
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| luscious | (adjective) having strong sexual appeal | Synonyms: juicy, lush, red-hot, toothsome, voluptuous |
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| (adjective) extremely pleasing to the sense of taste | Synonyms: delectable, delicious, pleasant-tasting, scrumptious, toothsome, yummy |
| lustrous | (adjective) brilliant | - |
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| (adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow | Synonyms: bright, burnished, shining, shiny |
| (adjective) reflecting light | Synonyms: glistening, glossy, sheeny, shining, shiny |
| luxurious | (adjective) displaying luxury and furnishing gratification to the senses | Synonyms: epicurean, luxuriant, sybaritic, voluptuary, voluptuous |
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| (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, opulent, princely, sumptuous |
| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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| macrencephalous | (adjective) having a large brain case | Synonyms: macrencephalic |
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| macrocephalous | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalic |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| magnanimous | (adjective) generous and understanding and tolerant | Synonyms: big, large |
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| (adjective) noble and generous in spirit | Synonyms: greathearted |
| magus | (noun) a magician or sorcerer of ancient times | - |
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| (noun) a member of the Zoroastrian priesthood of the ancient Persians | - |
| malicious | (adjective) having the nature of or resulting from malice | - |
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| malleus | (noun) the ossicle attached to the eardrum | Synonyms: hammer |
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| malodorous | (adjective) having an unpleasant smell | Synonyms: ill-smelling, malodourous, stinky, unpleasant-smelling |
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| malodourous | (adjective) having an unpleasant smell | Synonyms: ill-smelling, malodorous, stinky, unpleasant-smelling |
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| mandamus | (noun) an extraordinary writ commanding an official to perform a ministerial act that the law recognizes as an absolute duty and not a matter for the official's discretion; used only when all other judicial remedies fail | Synonyms: writ of mandamus |
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| manus | (noun) the (prehensile) extremity of the superior limb | Synonyms: hand, mitt, paw |
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| marasmus | (noun) extreme malnutrition and emaciation (especially in children); can result from inadequate intake of food or from malabsorption or metabolic disorders | - |
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| marvellous | (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvelous, phenomenal, rattling, terrific, tremendous, wonderful, wondrous |
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| (adjective) too improbable to admit of belief | Synonyms: improbable, marvelous, tall |
| (adjective) being or having the character of a miracle | Synonyms: marvelous, miraculous |
| marvelous | (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, phenomenal, rattling, terrific, tremendous, wonderful, wondrous |
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| (adjective) too improbable to admit of belief | Synonyms: improbable, marvellous, tall |
| (adjective) being or having the character of a miracle | Synonyms: marvellous, miraculous |
| meatus | (noun) a natural body passageway | - |
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| mecopterous | (adjective) of or relating to mecopterans | - |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| melilotus | (noun) erect annual or biennial plant grown extensively especially for hay and soil improvement | Synonyms: melilot, sweet clover |
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| mellifluous | (adjective) pleasing to the ear | Synonyms: dulcet, honeyed, mellisonant, sweet |
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| melodious | (adjective) containing or constituting or characterized by pleasing melody | Synonyms: melodic, musical |
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| (adjective) having a musical sound; especially a pleasing tune | Synonyms: tuneful |
| membranous | (adjective) relating to or made of or similar to a membrane | - |
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| (adjective) characterized by formation of a membrane (or something resembling a membrane) | Synonyms: membrane-forming |
| mendacious | (adjective) intentionally untrue | - |
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| (adjective) given to lying | - |
| meniscus | (noun) (physics) the curved upper surface of a nonturbulent liquid in a vertical tube | - |
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| (noun) (optics) a lens that is concave on one side and convex on the other | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |
| mercurous | (adjective) of or containing mercury | Synonyms: mercuric |
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| meretricious | (adjective) like or relating to a prostitute | - |
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| (adjective) based on pretense; deceptively pleasing | Synonyms: gilded, glossy, specious |
| (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, flashy, garish, gaudy, gimcrack, loud, tacky, tatty, tawdry, trashy |
| meritorious | (adjective) deserving reward or praise | Synonyms: meritable |
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| mesohippus | (noun) North American three-toed Oligocene animal; probably not directly ancestral to modern horses | - |
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| metabolous | (adjective) undergoing metamorphosis | Synonyms: metabolic |
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| metacarpus | (noun) the part of the hand between the carpus and phalanges | - |
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| metamorphous | (adjective) of or relating to metamorphosis (especially of rocks) | Synonyms: metamorphic |
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| (adjective) produced by metamorphosis | - |
| metatarsus | (noun) the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds | - |
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| meticulous | (adjective) marked by extreme care in treatment of details | - |
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| (adjective) marked by precise accordance with details | Synonyms: punctilious |
| micaceous | (adjective) hydrous silicates of or relating to or resembling mica | - |
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| microcephalous | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalic, nanocephalic |
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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| minacious | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minatory, ominous, sinister, threatening |
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| minibus | (noun) a light bus (4 to 10 passengers) | - |
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| minimus | (noun) the fifth digit; the little finger or little toe | - |
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| minus | (adjective) on the negative side or lower end of a scale | - |
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| (adjective) involving disadvantage or harm | Synonyms: negative |
| (noun) an arithmetic operation in which the difference between two numbers is calculated | Synonyms: subtraction |
| miraculous | (adjective) peculiarly fortunate or appropriate; as if by divine intervention | Synonyms: heaven-sent, providential |
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| (adjective) being or having the character of a miracle | Synonyms: marvellous, marvelous |
| miscellaneous | (adjective) consisting of a haphazard assortment of different kinds | Synonyms: assorted, mixed, motley, sundry |
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| (adjective) having many aspects or qualities | Synonyms: many-sided, multifaceted, multifarious |
| mischievous | (adjective) deliberately causing harm or damage | - |
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| (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, implike, pixilated, prankish, puckish, wicked |
| misogynous | (adjective) hating women in particular | Synonyms: misogynistic |
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| missus | (noun) informal term of address for someone's wife | Synonyms: missis |
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| modiolus | (noun) the central conical bony pillar of the cochlea | - |
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| modulus | (noun) (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance | - |
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| (noun) the absolute value of a complex number | - |
| (noun) an integer that can be divided without remainder into the difference between two other integers | - |
| momentaneous | (adjective) lasting for a markedly brief time | Synonyms: fleeting, fugitive, momentary |
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| momentous | (adjective) of very great significance | - |
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| monandrous | (adjective) having only one husband at a time | - |
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| monecious | (adjective) having male and female reproductive organs in the same plant or animal | Synonyms: monoecious, monoicous |
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| monestrous | (adjective) having one estrous cycle per year | Synonyms: monoestrous |
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| monochromous | (adjective) having or appearing to have only one color | Synonyms: monochromatic, monochrome, monochromic |
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