| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |
| borosilicate | (noun) a salt of boric and silicic acids | - |
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| cornsilk | (noun) each of the long filamentous styles that grow as a silky tuft at the tip of an ear of Indian corn | Synonyms: corn silk |
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| disillusion | (noun) freeing from false belief or illusions | Synonyms: disenchantment, disillusionment |
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| disillusionment | (noun) freeing from false belief or illusions | Synonyms: disenchantment, disillusion |
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| dissilience | (noun) the emergence of seeds as seed pods burst open when they are ripe | - |
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| doorsill | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorstep, threshold |
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| ensilage | (noun) fodder harvested while green and kept succulent by partial fermentation as in a silo | Synonyms: silage |
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| epsilon | (noun) the 5th letter of the Greek alphabet | - |
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| fluosilicate | (noun) salt of fluosilicic acid | - |
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| fossil | (noun) the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil | - |
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| (noun) someone whose style is out of fashion | Synonyms: dodo, fogey, fogy |
| fossilisation | (noun) becoming inflexible or out of date | Synonyms: fossilization |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilization |
| fossilist | (noun) a specialist in paleontology | Synonyms: palaeontologist, paleontologist |
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| fossilization | (noun) becoming inflexible or out of date | Synonyms: fossilisation |
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| (noun) the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone | Synonyms: fossilisation |
| fossilology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: palaeontology, paleontology |
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| fusil | (noun) a light flintlock musket | - |
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| fusilier | (noun) (formerly) a British infantryman armed with a light flintlock musket | - |
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| fusillade | (noun) rapid simultaneous discharge of firearms | Synonyms: burst, salvo, volley |
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| microfossil | (noun) a fossil that must be studied microscopically | - |
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| missile | (noun) a weapon that is forcibly thrown or projected at a targets but is not self-propelled | Synonyms: projectile |
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| (noun) a rocket carrying a warhead of conventional or nuclear explosives; may be ballistic or directed by remote control | - |
| psilocin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocybin |
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| (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocine, psilocyn, psilotsin |
| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| psilocybin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocin |
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| psilocyn | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilotsin |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| psilophyte | (noun) any plant of the order Psilophytales: a savannah plant | - |
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| psilophyton | (noun) any plant or fossil of the genus Psilophyton | - |
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| psilosis | (noun) falling out of hair | - |
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| (noun) a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation | Synonyms: sprue, tropical sprue |
| psilotsin | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilocyn |
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| pusillanimity | (noun) contemptible fearfulness | Synonyms: pusillanimousness |
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| pusillanimousness | (noun) contemptible fearfulness | Synonyms: pusillanimity |
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| quicksilver | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, hydrargyrum, mercury |
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| resilience | (noun) the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit | Synonyms: resiliency |
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| (noun) an occurrence of rebounding or springing back | Synonyms: resiliency |
| resiliency | (noun) the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit | Synonyms: resilience |
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| (noun) an occurrence of rebounding or springing back | Synonyms: resilience |
| rosilla | (noun) a sneezeweed of southwestern United States especially southern California | Synonyms: Helenium puberulum |
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| salsilla | (noun) tropical vine having pink-and-yellow flowers spotted purple and edible roots sometimes boiled as a potato substitute; West Indies to northern South America | Synonyms: Bomarea edulis |
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| (noun) tropical vine having umbels of small purple flowers and edible roots sometimes boiled as a potato substitute; Colombia | Synonyms: Bomarea salsilla |
| silage | (noun) fodder harvested while green and kept succulent by partial fermentation as in a silo | Synonyms: ensilage |
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| sild | (noun) any of various young herrings (other than brislings) canned as sardines in Norway | - |
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| sildenafil | (noun) virility drug (trade name Viagra) used to treat erectile dysfunction in men | Synonyms: sildenafil citrate, Viagra |
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| silence | (noun) the absence of sound | Synonyms: quiet |
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| (noun) a refusal to speak when expected | Synonyms: muteness |
| (noun) the trait of keeping things secret | Synonyms: secrecy, secretiveness |
| (noun) the state of being silent (as when no one is speaking) | - |
| silencer | (noun) a tubular acoustic device inserted in the exhaust system that is designed to reduce noise | Synonyms: muffler |
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| (noun) short tube attached to the muzzle of a gun that deadens the sound of firing | - |
| silene | (noun) any plant of the genus Silene | Synonyms: campion, catchfly |
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| silents | (noun) a movie without a soundtrack | Synonyms: silent movie, silent picture |
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| silenus | (noun) any of the minor woodland deities who were companions of Dionysus (similar to the satyrs) | - |
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| silesia | (noun) a sturdy twill-weave cotton fabric; used for pockets and linings | - |
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| silex | (noun) a pure form of finely ground silica | - |
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| silhouette | (noun) a drawing of the outline of an object; filled in with some uniform color | - |
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| (noun) an outline of a solid object (as cast by its shadow) | - |
| silica | (noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite | Synonyms: silicon dioxide, silicon oxide |
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| silicate | (noun) a salt or ester derived from silicic acid | - |
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| silicide | (noun) any of various compounds of silicon with a more electropositive element or radical | - |
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| silicle | (noun) short broad silique occurring in some cruciferous plants | - |
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| silicon | (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors | Synonyms: atomic number 14, Si |
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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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| silicosis | (noun) a lung disease caused by inhaling particles of silica or quartz or slate | - |
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| siliqua | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: silique |
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| silique | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: siliqua |
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| silk | (noun) a fabric made from the fine threads produced by certain insect larvae | - |
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| (noun) animal fibers produced by silkworms and other larvae that spin cocoons and by most spiders | - |
| silkgrass | (noun) valuable forage grass of dry upland areas and plains of western North America to northern Mexico | Synonyms: Indian millet, mountain rice, Oryzopsis hymenoides, silk grass |
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| silkiness | (noun) the smooth feel of silk fabric | Synonyms: sleekness |
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| silks | (noun) the brightly colored garments of a jockey; emblematic of the stable | - |
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| silkscreen | (noun) a print made using a stencil process in which an image or design is superimposed on a very fine mesh screen and printing ink is squeegeed onto the printing surface through the area of the screen that is not covered by the stencil | Synonyms: serigraph, silk screen print |
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| silkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: milkweed |
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| silkwood | (noun) a fast-growing tropical American evergreen having white flowers and fleshy edible fruit; a bark yields a silky fiber used in cordage and wood is valuable for staves | Synonyms: calabur tree, calabura, Jamaican cherry, Muntingia calabura, silk wood |
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| silkworm | (noun) the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk | - |
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| (noun) larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon | Synonyms: giant silkworm, wild wilkworm |
| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| sillabub | (noun) sweetened cream beaten with wine or liquor | Synonyms: syllabub |
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| (noun) spiced hot milk with rum or wine | Synonyms: syllabub |
| silliness | (noun) a ludicrous folly | Synonyms: absurdity, fatuity, fatuousness |
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| (noun) an impulsive scatterbrained manner | Synonyms: giddiness |
| silly | (noun) a word used for misbehaving children | - |
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| silo | (noun) a cylindrical tower used for storing silage | - |
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| (noun) military installation consisting of an underground structure where ballistic missiles can be stored and fired | - |
| siloxane | (noun) any of a large class of compounds that have alternate silicon and oxygen atoms | - |
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| silt | (noun) mud or clay or small rocks deposited by a river or lake | - |
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| siltstone | (noun) a fine-grained sandstone of consolidated silt | - |
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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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| silva | (noun) the forest trees growing in a country or region | Synonyms: sylva |
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| silvan | (noun) a spirit that lives in or frequents the woods | Synonyms: sylvan |
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| silver | (noun) silverware eating utensils | Synonyms: flatware |
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| (noun) a trophy made of silver (or having the appearance of silver) that is usually awarded for winning second place in a competition | Synonyms: silver medal |
| (noun) a light shade of grey | Synonyms: ash gray, ash grey, silver gray, silver grey |
| (noun) coins made of silver | - |
| (noun) a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography | Synonyms: Ag, atomic number 47 |
| silverback | (noun) an adult male gorilla with grey hairs across the back | - |
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| silverberry | (noun) deciduous unarmed North American shrub with silvery leaves and fruits | Synonyms: Elaeagnus commutata, silver-bush, silver berry, silverbush |
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| silverbush | (noun) deciduous unarmed North American shrub with silvery leaves and fruits | Synonyms: Elaeagnus commutata, silver-bush, silver berry, silverberry |
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| (noun) silvery hairy European shrub with evergreen foliage and pale yellow flowers | Synonyms: Anthyllis barba-jovis, Jupiter's beard, silver-bush |
| silverfish | (noun) a silvery variety of Carassius auratus | - |
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| (noun) silver-grey wingless insect found in houses feeding on book bindings and starched clothing | Synonyms: Lepisma saccharina |
| silverpoint | (noun) a drawing made on specially prepared paper with an instrument having a silver tip (15th and 16th centuries) | - |
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| silverrod | (noun) plant of eastern North America having creamy white flowers | Synonyms: Solidago bicolor |
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| silverside | (noun) small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States | Synonyms: silversides |
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| silversides | (noun) small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States | Synonyms: silverside |
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| (noun) the common North American shiner | Synonyms: common shiner, Notropis cornutus |
| silversmith | (noun) someone who makes or repairs articles of silver | Synonyms: silver-worker, silverworker |
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| silverspot | (noun) butterfly with silver spots on the underside of the hind wings | - |
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| silversword | (noun) low-growing plant found only in volcanic craters on Hawaii having rosettes of narrow pointed silver-green leaves and clusters of profuse red-purple flowers on a tall stem | Synonyms: Argyroxiphium sandwicense |
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| silvertip | (noun) powerful brownish-yellow bear of the uplands of western North America | Synonyms: grizzly, grizzly bear, silver-tip, Ursus arctos horribilis, Ursus horribilis |
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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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| silverware | (noun) tableware made of silver or silver plate or pewter or stainless steel | - |
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| silverweed | (noun) any of various twining shrubs of the genus Argyreia having silvery leaves and showy purple flowers | - |
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| (noun) low-growing perennial having leaves silvery beneath; northern United States, Europe, Asia | Synonyms: goose-tansy, goose grass, Potentilla anserina |
| silverwork | (noun) decorative work made of silver | - |
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| silverworker | (noun) someone who makes or repairs articles of silver | Synonyms: silver-worker, silversmith |
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| silvex | (noun) a herbicide that is effective in controlling woody plants but is toxic to animals | - |
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| silviculture | (noun) the branch of forestry dealing with the development and care of forests | - |
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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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| tonsilla | (noun) either of two masses of lymphatic tissue one on each side of the oral pharynx | Synonyms: faucial tonsil, palatine tonsil, tonsil |
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