| safranine | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranin |
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| sailplane | (noun) aircraft supported only by the dynamic action of air against its surfaces | Synonyms: glider |
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| (verb) fly a plane without an engine | Synonyms: soar |
| saline | (adjective) containing salt | - |
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| (noun) an isotonic solution of sodium chloride and distilled water | Synonyms: saline solution |
| saltine | (noun) a cracker sprinkled with salt before baking | - |
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| sandstone | (noun) a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.) | - |
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| sane | (adjective) mentally healthy; free from mental disorder | - |
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| (adjective) marked by sound judgment; having good reason | Synonyms: reasonable |
| sanguine | (adjective) inclined to a healthy reddish color often associated with outdoor life | Synonyms: florid, rubicund, ruddy |
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| (adjective) confidently optimistic and cheerful | Synonyms: sanguineous |
| (noun) chalk of a reddish-brown colour that resembles dried blood | Synonyms: red chalk |
| (noun) a blood-red color | - |
| sapphirine | (adjective) made of or resembling sapphire | - |
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| (noun) a rare light blue or green mineral; consists of aluminum and magnesium silicate and occurs as small grains in some metamorphic rocks | - |
| sarcodine | (noun) protozoa that move and capture food by forming pseudopods | Synonyms: sarcodinian |
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| sarcosine | (noun) a sweetish crystalline amino acid | - |
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| sardine | (noun) any of various small edible herring or related food fishes frequently canned | - |
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| (noun) small fishes found in great schools along coasts of Europe; smaller and rounder than herring | Synonyms: pilchard, Sardina pilchardus |
| (noun) small fatty fish usually canned | Synonyms: pilchard |
| (noun) a deep orange-red variety of chalcedony | Synonyms: sard, sardius |
| saturnine | (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, sour, sullen |
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| (adjective) bitter or scornful | - |
| saxicoline | (adjective) growing on or living among rocks | Synonyms: saxatile, saxicolous |
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| saxophone | (noun) a single-reed woodwind with a conical bore | Synonyms: sax |
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| scalene | (adjective) of or relating to any of the scalene muscles | - |
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| (adjective) of a triangle having three sides of different lengths | - |
| scallopine | (noun) sauteed cutlets (usually veal or poultry) that have been pounded thin and coated with flour | Synonyms: scallopini |
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| scene | (noun) the painted structures of a stage set that are intended to suggest a particular locale | Synonyms: scenery |
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| (noun) graphic art consisting of the graphic or photographic representation of a visual percept | Synonyms: view |
| (noun) the visual percept of a region | Synonyms: aspect, panorama, prospect, view, vista |
| (noun) a subdivision of an act of a play or performance | - |
| (noun) a consecutive series of pictures that constitutes a unit of action in a film | Synonyms: shot |
| (noun) an incident (real or imaginary) | - |
| (noun) the place where some action occurs | - |
| (noun) the context and environment in which something is set | Synonyms: setting |
| (noun) a situation treated as an observable object | Synonyms: picture |
| (noun) a display of bad temper | Synonyms: conniption, fit, tantrum |
| scone | (noun) small biscuit (rich with cream and eggs) cut into diamonds or sticks and baked in an oven or (especially originally) on a griddle | - |
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| scopolamine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: hyoscine |
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| seaborne | (adjective) conveyed by sea | - |
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| seaplane | (noun) an airplane that can land on or take off from water | Synonyms: hydroplane |
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| (verb) glide on the water in a hydroplane | Synonyms: hydroplane |
| seine | (noun) a large fishnet that hangs vertically, with floats at the top and weights at the bottom | - |
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| (verb) fish with a seine; catch fish with a seine | - |
| semitone | (noun) the musical interval between adjacent keys on a keyboard instrument | Synonyms: half step |
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| sene | (noun) 100 sene equal 1 tala in Western Samoa | - |
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| sepaline | (adjective) resembling or characteristic of a sepal | Synonyms: sepaloid |
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| serene | (adjective) completely clear and fine | - |
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| (adjective) not agitated; without losing self-possession | Synonyms: calm, tranquil, unagitated |
| serine | (noun) a sweetish crystalline amino acid involved in the synthesis by the body of cysteine | - |
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| serotine | (noun) common brown bat of Europe | Synonyms: Eptesicus serotinus, European brown bat |
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| serpentine | (adjective) resembling a serpent in form | Synonyms: snakelike, snaky |
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| sertraline | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Zoloft) | Synonyms: Zoloft |
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| setline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: spiller, trawl, trawl line, trotline |
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| shaggymane | (noun) common edible mushroom having an elongated shaggy white cap and black spores | Synonyms: Coprinus comatus, shaggy cap, shaggymane mushroom |
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| shinbone | (noun) the inner and thicker of the two bones of the human leg between the knee and ankle | Synonyms: shin, shin bone, tibia |
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| shine | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, radiancy, refulgence, refulgency |
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| (verb) make (a surface) shine | Synonyms: polish, smooth, smoothen |
| (verb) experience a feeling of well-being or happiness, as from good health or an intense emotion | Synonyms: beam, glow, radiate |
| (verb) be shiny, as if wet | Synonyms: gleam, glint, glisten, glitter |
| (verb) have a complexion with a strong bright color, such as red or pink | Synonyms: beam, glow, radiate |
| (verb) touch or seem as if touching visually or audibly | Synonyms: fall, strike |
| (verb) be distinguished or eminent | - |
| (verb) be clear and obvious | - |
| (verb) emit light; be bright, as of the sun or a light | Synonyms: beam |
| (verb) be bright by reflecting or casting light | Synonyms: reflect |
| (verb) throw or flash the light of (a lamp) | - |
| shoeshine | (noun) the act of shining shoes | - |
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| (noun) a shiny finish put on shoes with polish and buffing | - |
| shoreline | (noun) a boundary line between land and water | - |
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| shrine | (noun) a place of worship hallowed by association with some sacred thing or person | - |
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| (verb) enclose in a shrine | Synonyms: enshrine |
| sibylline | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, kabbalistic, qabalistic |
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| (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibyllic, vatic, vatical |
| sideline | (noun) an auxiliary activity | Synonyms: avocation, by-line, hobby, pursuit, spare-time activity |
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| (noun) an auxiliary line of merchandise | - |
| (noun) a line that marks the side boundary of a playing field | Synonyms: out of bounds |
| (verb) remove from the center of activity or attention; place into an inferior position | - |
| silene | (noun) any plant of the genus Silene | Synonyms: campion, catchfly |
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| silicone | (noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation | Synonyms: silicone polymer |
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| siloxane | (noun) any of a large class of compounds that have alternate silicon and oxygen atoms | - |
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| siltstone | (noun) a fine-grained sandstone of consolidated silt | - |
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| silvervine | (noun) ornamental vine of eastern Asia having yellow edible fruit and leaves with silver-white markings | Synonyms: Actinidia polygama, silver vine |
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| simazine | (noun) a herbicide used to control weeds (especially among crops) | - |
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| sine | (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sin |
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| skyline | (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, horizon, sensible horizon, visible horizon |
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| (noun) the outline of objects seen against the sky | - |
| slackline | (noun) a partially tensioned line for balance or walking | - |
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| smartphone | (noun) a mobile phone with more advanced computing capability and connectivity than basic feature phones | Synonyms: smart phone |
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| snapline | (noun) a chalked string used in the building trades to make a straight line on a vertical surface | Synonyms: chalk line, snap line |
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| soapstone | (noun) a soft heavy compact variety of talc having a soapy feel; used to make hearths and tabletops and ornaments | Synonyms: soap-rock, soaprock, steatite |
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| soigne | (adjective) polished and well-groomed; showing sophisticated elegance | Synonyms: soignee |
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| someone | (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: individual, mortal, person, somebody, soul |
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| sone | (noun) a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold | - |
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| sourdine | (noun) an organ stop resulting in a soft muted sound | - |
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| (noun) a mute for a violin | Synonyms: sordino |
| sousaphone | (noun) the lowest brass wind instrument | Synonyms: bass horn, tuba |
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| soutane | (noun) a long cassock with buttons down the front; worn by Roman Catholic priests | - |
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| sowbane | (noun) herb considered fatal to swine | Synonyms: Chenopodium hybridum, red goosefoot |
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| speakerphone | (noun) a telephone with a microphone and loudspeaker; can be used without picking up a handset; several people can participate in a call at the same time | - |
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| sphingine | (adjective) resembling a sphinx | - |
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| spine | (noun) a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: backbone |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, backbone, rachis, spinal column, vertebral column |
| (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, prickle, spikelet, sticker, thorn |
| (noun) any sharply pointed projection | Synonyms: acantha, spur |
| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| spline | (noun) a thin strip (wood or metal) | Synonyms: slat |
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| (noun) a flexible strip (wood or rubber) used in drawing curved lines | - |
| spodumene | (noun) a pyroxene mineral consisting of lithium aluminum silicate; a source of lithium | - |
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| sthene | (noun) a unit of force equal to 1000 newtons | - |
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| stone | (adjective) of any of various dull tannish or grey colors | - |
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| (noun) building material consisting of a piece of rock hewn in a definite shape for a special purpose | - |
| (noun) a lack of feeling or expression or movement | - |
| (noun) a lump or mass of hard consolidated mineral matter | Synonyms: rock |
| (noun) the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed | Synonyms: endocarp, pit |
| (noun) an avoirdupois unit used to measure the weight of a human body; equal to 14 pounds | - |
| (noun) material consisting of the aggregate of minerals like those making up the Earth's crust | Synonyms: rock |
| (noun) a crystalline rock that can be cut and polished for jewelry | Synonyms: gem, gemstone |
| (verb) remove the pits from | Synonyms: pit |
| (verb) kill by throwing stones at | Synonyms: lapidate |
| storyline | (noun) the plot of a book or play or film | Synonyms: plot line |
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| strapline | (noun) a secondary heading, especially one printed above another. | - |
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| streamline | (verb) contour economically or efficiently | - |
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| strychnine | (noun) an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant | - |
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| styrene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, vinylbenzene |
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| subalpine | (adjective) growing at high altitudes | Synonyms: alpestrine |
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| submarine | (adjective) beneath the surface of the sea | Synonyms: undersea |
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| (noun) a submersible warship usually armed with torpedoes | Synonyms: pigboat, sub |
| (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: bomber, Cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine sandwich, torpedo, wedge, zep |
| (verb) attack by submarine | - |
| (verb) bring down with a blow to the legs | - |
| (verb) throw with an underhand motion | - |
| (verb) control a submarine | - |
| (verb) move forward or under in a sliding motion | - |
| subroutine | (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, routine, subprogram |
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| succinylcholine | (noun) a muscle relaxant for striated muscle that is used as an adjunct to anesthesia during certain surgical procedures | - |
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| sugarcane | (noun) tall tropical southeast Asian grass having stout fibrous jointed stalks; sap is a chief source of sugar | Synonyms: Saccharum officinarum, sugar cane |
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| (noun) juicy canes whose sap is a source of molasses and commercial sugar; fresh canes are sometimes chewed for the juice | Synonyms: sugar cane |
| sulfadiazine | (noun) a sulfa drug used in treating meningitis and pneumonia and other infections | - |
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| sulfamethazine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamezathine |
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| sulfamezathine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamethazine |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| sunshine | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunniness |
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| (noun) the rays of the sun | Synonyms: sun, sunlight |
| (noun) moderate weather; suitable for outdoor activities | Synonyms: fair weather, temperateness |
| sunstone | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: aventurine |
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| superfine | (adjective) (used especially of merchandise) very fine in quality | - |
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| (adjective) of extremely fine size or texture | - |
| (adjective) excessively delicate or refined | Synonyms: overrefined |
| supervene | (verb) take place as an additional or unexpected development | - |
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| supine | (adjective) passive as a result of indolence or indifference | - |
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| (adjective) lying face upward | Synonyms: resupine |
| swine | (noun) stout-bodied short-legged omnivorous animals | - |
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| sylvine | (noun) a mineral consisting of native potassium chloride; an important ore of potassium that is found in sedimentary beds | Synonyms: sylvite |
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| tailplane | (noun) the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged | Synonyms: horizontal stabiliser, horizontal stabilizer |
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| tambourine | (noun) a shallow drum with a single drumhead and with metallic disks in the sides | - |
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| tangerine | (adjective) of a strong reddish orange color | - |
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| (noun) a reddish to vivid orange color | - |
| (noun) any of various deep orange mandarins grown in the United States and southern Africa | - |
| (noun) a variety of mandarin orange, known in Telugu and Portugal as kamala kaya and in Australia as a mandarin | Synonyms: tangerine tree |
| tapeline | (noun) measuring instrument consisting of a narrow strip (cloth or metal) marked in inches or centimeters and used for measuring lengths | Synonyms: tape, tape measure |
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| taurine | (adjective) of or relating to or resembling a bull | - |
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| (noun) a colorless crystalline substance obtained from the bile of mammals | - |
| telephone | (noun) electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds | Synonyms: phone, telephone set |
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| (noun) transmitting speech at a distance | Synonyms: telephony |
| (verb) get or try to get into communication (with someone) by telephone | Synonyms: call, call up, phone, ring |
| terbinafine | (noun) an oral antifungal drug (trade name Lamisil) used to treat cases of fungal nail disease | Synonyms: Lamisil |
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| terpene | (noun) an unsaturated hydrocarbon obtained from plants | - |
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| terpinene | (noun) any of a group of isomeric hydrocarbons that are classified as terpenes. | - |
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| terrene | (adjective) of or relating to or inhabiting the land as opposed to the sea or air | Synonyms: tellurian, telluric, terrestrial |
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| (adjective) belonging to this earth or world; not ideal or heavenly | Synonyms: mundane |
| terrine | (noun) a pate or fancy meatloaf baked in an earthenware casserole | - |
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| testosterone | (noun) a potent androgenic hormone produced chiefly by the testes; responsible for the development of male secondary sex characteristics | - |
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| tetracaine | (noun) a crystalline compound used in the form of a hydrochloride as a local anesthetic | - |
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