| 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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| 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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| 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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| mandril | (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: arbor, mandrel, spindle |
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| microfossil | (noun) a fossil that must be studied microscopically | - |
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| mil | (noun) a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire) | - |
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| (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cc, cubic centimeter, cubic centimetre, milliliter, millilitre, ml |
| (noun) an angular unit used in artillery; equal to 1/6400 of a complete revolution | - |
| (noun) a Cypriot monetary unit equal to one thousandth of a pound | - |
| (noun) a Swedish unit of length equivalent to 10 km | Synonyms: mile, Swedish mile |
| milfoil | (noun) ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America | Synonyms: Achillea millefolium, yarrow |
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| minoxidil | (noun) a vasodilator (trade name Loniten) used to treat severe hypertension; one side effect is hirsutism so it is also sold (trade name Rogaine) as a treatment for male-patterned baldness | Synonyms: Loniten, Rogaine |
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| monorail | (noun) a railway having a single track | - |
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| myofibril | (noun) one of many contractile filaments that make up a striated muscle fiber | Synonyms: myofibrilla, sarcostyle |
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| nail | (noun) a thin pointed piece of metal that is hammered into materials as a fastener | - |
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| (noun) horny plate covering and protecting part of the dorsal surface of the digits | - |
| (noun) a former unit of length for cloth equal to 1/16 of a yard | - |
| neurofibril | (noun) Any of the long, thin, microscopic fibrils that run through the body of a neuron and extend into the axon and dendrites, giving the neuron support and shape. | - |
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| neuropil | (noun) the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded | Synonyms: neuropile |
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| neutrophil | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophile |
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| nihil | (noun) (Latin) nil; nothing (as used by a sheriff after an unsuccessful effort to serve a writ) | - |
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| nil | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nix, nothing, null, zero, zilch, zip, zippo |
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| nitril | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitrile |
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| nombril | (noun) the center point on a shield | - |
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| nonpareil | (noun) colored beads of sugar used as a topping on e.g. candies and cookies | - |
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| (noun) a flat disk of chocolate covered with beads of colored sugar | - |
| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: apotheosis, ideal, nonesuch, nonsuch, paragon, saint |
| nostril | (noun) either one of the two external openings to the nasal cavity in the nose | Synonyms: anterior naris |
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| oil | (noun) oil paint containing pigment that is used by an artist | Synonyms: oil color, oil colour |
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| (noun) any of a group of liquid edible fats that are obtained from plants | Synonyms: vegetable oil |
| (noun) a slippery or viscous liquid or liquefiable substance not miscible with water | - |
| (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, petroleum, rock oil |
| orchil | (noun) any of various lecanoras that yield the dye archil | Synonyms: archil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: archil, cudbear |
| oxtail | (noun) the skinned tail of cattle; used especially for soups | - |
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| pail | (noun) a roughly cylindrical vessel that is open at the top | Synonyms: bucket |
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| (noun) the quantity contained in a pail | Synonyms: pailful |
| parasail | (noun) parachute that will lift a person up into the air when it is towed by a motorboat or a car | - |
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| pastil | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastille, troche |
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| pencil | (noun) a thin cylindrical pointed writing implement; a rod of marking substance encased in wood | - |
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| (noun) a cosmetic in a long thin stick; designed to be applied to a particular part of the face | - |
| (noun) a figure formed by a set of straight lines or light rays meeting at a point | - |
| (noun) graphite (or a similar substance) used in such a way as to be a medium of communication | - |
| pentail | (noun) brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia | Synonyms: pen-tail, pen-tailed tree shrew |
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| peril | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: danger, risk |
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| (noun) a source of danger; a possibility of incurring loss or misfortune | Synonyms: endangerment, hazard, jeopardy, risk |
| (noun) a state of danger involving risk | Synonyms: riskiness |
| pigtail | (noun) a plait of braided hair | - |
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| pintail | (noun) long-necked river duck of the Old and New Worlds having elongated central tail feathers | Synonyms: Anas acuta, pin-tailed duck |
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| pistil | (noun) the female ovule-bearing part of a flower composed of ovary and style and stigma | - |
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| ponytail | (noun) a hair style that draws the hair back so that it hangs down in back of the head like a pony's tail | - |
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| propylthiouracil | (noun) a crystalline compound used as an antithyroid drug in the treatment of goiter | - |
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| pupil | (noun) the contractile aperture in the center of the iris of the eye; resembles a large black dot | - |
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| (noun) a learner who is enrolled in an educational institution | Synonyms: educatee, student |
| (noun) a young person attending school (up through senior high school) | Synonyms: school-age child, schoolchild |
| quail | (noun) small gallinaceous game birds | - |
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| (noun) flesh of quail; suitable for roasting or broiling if young; otherwise must be braised | - |
| rail | (noun) any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud | - |
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| (noun) a horizontal bar (usually of wood or metal) | - |
| (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rails, runway, track |
| (noun) a barrier consisting of a horizontal bar and supports | Synonyms: railing |
| (noun) short for railway | - |
| ramipril | (noun) an ACE inhibitor (trade name Altace) used to treat high blood pressure or in some patients who have had a heart attack | Synonyms: Altace |
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| rattail | (noun) deep-sea fish with a large head and body and long tapering tail | Synonyms: grenadier, rattail fish |
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| recoil | (noun) a movement back from an impact | Synonyms: backlash, rebound, repercussion |
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| (noun) the backward jerk of a gun when it is fired | Synonyms: kick |
| redtail | (noun) dark brown American hawk species having a reddish-brown tail | Synonyms: Buteo jamaicensis, red-tailed hawk |
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| (noun) European songbird with a reddish breast and tail; related to Old World robins | Synonyms: redstart |
| retail | (noun) the selling of goods to consumers; usually in small quantities and not for resale | - |
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| ridgil | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgeling, ridgling |
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| ringtail | (noun) an immature golden eagle | - |
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| (noun) North American raccoon | Synonyms: common raccoon, common racoon, coon, Procyon lotor |
| (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat |
| (noun) monkey of Central America and South America having thick hair on the head that resembles a monk's cowl | Synonyms: capuchin, Cebus capucinus |
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| sail | (noun) an ocean trip taken for pleasure | Synonyms: cruise |
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| (noun) a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel | Synonyms: canvas, canvass, sheet |
| (noun) any structure that resembles a sail | - |
| scissortail | (noun) grey flycatcher of the southwestern United States and Mexico and Central America having a long forked tail and white breast and salmon and scarlet markings | Synonyms: Muscivora-forficata, scissortailed flycatcher |
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| seasnail | (noun) small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish | Synonyms: Liparis liparis, sea snail, snailfish |
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| (noun) any of several creeping marine gastropods with a spirally coiled shell: whelks, tritons, moon shells, neritids | - |
| serail | (noun) living quarters reserved for wives and concubines and female relatives in a Muslim household | Synonyms: hareem, harem, seraglio |
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| shirttail | (noun) fabric forming the tail of a shirt | - |
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| (noun) a brief addendum at the end of a newspaper article | - |
| sildenafil | (noun) virility drug (trade name Viagra) used to treat erectile dysfunction in men | Synonyms: sildenafil citrate, Viagra |
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| skysail | (noun) the sail above the royal on a square-rigger | - |
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| snail | (noun) freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell | - |
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| (noun) edible terrestrial snail usually served in the shell with a sauce of melted butter and garlic | Synonyms: escargot |
| soil | (noun) the geographical area under the jurisdiction of a sovereign state | Synonyms: territory |
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| (noun) material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use) | Synonyms: ground, land |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, stain |
| (noun) the part of the earth's surface consisting of humus and disintegrated rock | Synonyms: dirt |
| spandril | (noun) an approximately triangular surface area between two adjacent arches and the horizontal plane above them | Synonyms: spandrel |
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| spoil | (noun) the act of stripping and taking by force | Synonyms: despoilation, despoilment, despoliation, spoilation, spoliation |
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| (noun) the act of spoiling something by causing damage to it | Synonyms: spoilage, spoiling |
| (noun) (usually plural) valuables taken by violence (especially in war) | - |
| sprigtail | (noun) large grouse of prairies and open forests of western North America | Synonyms: Pedioecetes phasianellus, sharp-tailed grouse, sprig tail |
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| springtail | (noun) any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water | Synonyms: collembolan |
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| spritsail | (noun) a fore-and-aft sail extended by a sprit | - |
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| squaretail | (noun) sluggish square-tailed fish armored with tough bony scales; of deep warm waters | - |
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| staysail | (noun) a fore-and-aft sail set on a stay (as between two masts) | - |
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| stencil | (noun) a sheet of material (metal, plastic, cardboard, waxed paper, silk, etc.) that has been perforated with a pattern (printing or a design); ink or paint can pass through the perforations to create the printed pattern on the surface below | - |
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| subsoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: undersoil |
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| swallowtail | (noun) a man's full-dress jacket with two long tapering tails at the back | Synonyms: morning coat, swallow-tailed coat |
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| swordtail | (noun) freshwater fish of Central America having a long swordlike tail; popular aquarium fish | Synonyms: helleri, topminnow, Xyphophorus helleri |
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| tadalafil | (noun) virility drug (trade name Cialis) used to treat erectile dysfunction in men | Synonyms: Cialis |
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| taffrail | (noun) the railing around the stern of a ship | - |
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| tail | (noun) the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body | - |
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| (noun) the rear part of a ship | Synonyms: after part, poop, quarter, stern |
| (noun) the rear part of an aircraft | Synonyms: empennage, tail assembly |
| (noun) (usually plural) the reverse side of a coin that does not bear the representation of a person's head | - |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail end, tooshie, tush |
| (noun) a spy employed to follow someone and report their movements | Synonyms: shadow, shadower |
| (noun) any projection that resembles the tail of an animal | Synonyms: tail end |
| (noun) the time of the last part of something | Synonyms: fag end, tail end |
| telsontail | (noun) any of several minute primitive wingless and eyeless insects having a cone-shaped head; inhabit damp soil or decaying organic matter | Synonyms: proturan |
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| tendril | (noun) slender stem-like structure by which some twining plants attach themselves to an object for support | - |
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| thiouracil | (noun) depresses the function of the thyroid gland | - |
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| thumbnail | (noun) the nail of the thumb | - |
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| tinfoil | (noun) foil made of tin or an alloy of tin and lead | Synonyms: tin foil |
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| toenail | (noun) the nail at the end of a toe | - |
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| toil | (noun) productive work (especially physical work done for wages) | Synonyms: labor, labour |
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| tonsil | (noun) either of two masses of lymphatic tissue one on each side of the oral pharynx | Synonyms: faucial tonsil, palatine tonsil, tonsilla |
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| topsail | (noun) a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast | - |
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| topsoil | (noun) the layer of soil on the surface | Synonyms: surface soil |
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| trail | (noun) a path or track roughly blazed through wild or hilly country | - |
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| (noun) evidence pointing to a possible solution | Synonyms: lead, track |
| (noun) a track or mark left by something that has passed | - |
| trandolapril | (noun) an ACE inhibiting drug (trade name Mavik) used in some patients after a heart attack or to treat hypertension | Synonyms: Mavik |
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| travail | (noun) use of physical or mental energy; hard work | Synonyms: effort, elbow grease, exertion, sweat |
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| (noun) concluding state of pregnancy; from the onset of contractions to the birth of a child | Synonyms: childbed, confinement, labor, labour, lying-in, parturiency |
| treenail | (noun) a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast | Synonyms: trenail, trunnel |
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| trefoil | (noun) an architectural ornament in the form of three arcs arranged in a circle | - |
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| (noun) a plant of the genus Trifolium | Synonyms: clover |
| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, medick |
| trenail | (noun) a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast | Synonyms: treenail, trunnel |
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| tripletail | (noun) large food fish of warm waters worldwide having long anal and dorsal fins that with a caudal fin suggest a three-lobed tail | - |
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| tumbril | (noun) a farm dumpcart for carrying dung; carts of this type were used to carry prisoners to the guillotine during the French Revolution | Synonyms: tumbrel |
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| turmoil | (noun) disturbance usually in protest | Synonyms: agitation, excitement, hullabaloo, upheaval |
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| (noun) violent agitation | Synonyms: tumult |
| (noun) a violent disturbance | Synonyms: convulsion, upheaval |
| undersoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: subsoil |
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| uracil | (noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine | Synonyms: U |
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| utensil | (noun) an implement for practical use (especially in a household) | - |
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| vardenafil | (noun) virility drug (trade name Levitra) used to treat erectile dysfunction in men | Synonyms: Levitra |
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| veil | (noun) a garment that covers the head and face | Synonyms: head covering |
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| (noun) a vestment worn by a priest at High Mass in the Roman Catholic Church; a silk shawl | Synonyms: humeral veil |
| (noun) the inner membrane of embryos in higher vertebrates (especially when covering the head at birth) | Synonyms: caul, embryonic membrane |
| (noun) a membranous covering attached to the immature fruiting body of certain mushrooms | Synonyms: velum |
| ventail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: aventail, camail |
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| verapamil | (noun) a drug (trade names Calan and Isoptin) used as an oral or parenteral calcium blocker in cases of hypertension or congestive heart failure or angina or migraine | Synonyms: Calan, Isoptin |
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| verticil | (noun) a whorl of leaves growing around a stem | - |
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| vigil | (noun) a purposeful surveillance to guard or observe | Synonyms: watch |
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| (noun) the rite of staying awake for devotional purposes (especially on the eve of a religious festival) | Synonyms: watch |
| (noun) a period of sleeplessness | - |
| voicemail | (noun) a computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed | Synonyms: voice mail |
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| wagtail | (noun) Old World bird having a very long tail that jerks up and down as it walks | - |
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| wail | (noun) a cry of sorrow and grief | Synonyms: lament, lamentation, plaint |
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