| slipperwort | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: calceolaria |
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| slipstick | (noun) analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators | Synonyms: slide rule |
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| slipstream | (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, backwash, race, wash |
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| slipway | (noun) structure consisting of a sloping way down to the water from the place where ships are built or repaired | Synonyms: shipway, ways |
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| slit | (noun) a long narrow opening | - |
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| (noun) obscene terms for female genitals | Synonyms: cunt, puss, pussy, snatch, twat |
| (noun) a narrow fissure | - |
| (noun) a depression scratched or carved into a surface | Synonyms: dent, incision, prick, scratch |
| sliver | (noun) a thin fragment or slice (especially of wood) that has been shaved from something | Synonyms: paring, shaving |
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| (noun) a small thin sharp bit of wood or glass or metal | Synonyms: splinter |
| slivovitz | (noun) a colorless plum brandy popular in the Balkans | - |
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| slob | (noun) a coarse obnoxious person | Synonyms: pig, sloven, slovenly person |
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| slobber | (noun) saliva spilling from the mouth | Synonyms: dribble, drivel, drool |
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| slobberer | (noun) a person who dribbles | Synonyms: dribbler, driveller, drooler |
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| sloe | (noun) small sour dark purple fruit of especially the Allegheny plum bush | - |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: blackthorn, Prunus spinosa |
| (noun) wild plum of northeastern United States having dark purple fruits with yellow flesh | Synonyms: Alleghany plum, Allegheny plum, Prunus alleghaniensis |
| slogan | (noun) a favorite saying of a group, organization or individual | Synonyms: catchword, motto, shibboleth |
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| sloganeer | (noun) someone who coins and uses slogans to promote a cause | - |
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| sloganeering | (noun) persuasion by means of empty slogans | - |
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| slogger | (noun) a boxer noted for an ability to deliver hard punches | Synonyms: slugger |
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| (noun) someone who works slowly and monotonously for long hours | Synonyms: plodder |
| (noun) someone who walks in a laborious heavy-footed manner | Synonyms: plodder, trudger |
| sloop | (noun) a sailing vessel with a single mast set about one third of the boat's length aft of the bow | - |
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| slop | (noun) writing or music that is excessively sweet and sentimental | Synonyms: glop, mush, treacle |
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| (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, pigwash, slops, swill |
| (noun) (usually plural) weak or watery unappetizing food or drink | - |
| (noun) deep soft mud in water or slush | Synonyms: mire |
| (noun) (usually plural) waste water from a kitchen or bathroom or chamber pot that has to be emptied by hand | - |
| slope | (noun) the property possessed by a line or surface that departs from the horizontal | Synonyms: gradient |
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| (noun) an elevated geological formation | Synonyms: incline, side |
| sloppiness | (noun) the quality of not being careful or taking pains | Synonyms: carelessness |
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| (noun) falsely emotional in a maudlin way | Synonyms: drippiness, mawkishness, mushiness, sentimentality, soupiness |
| (noun) a lack of order and tidiness; not cared for | Synonyms: slovenliness, unkemptness |
| (noun) the wetness of ground that is covered or soaked with water | Synonyms: muddiness, wateriness |
| slops | (noun) cheap clothing (as formerly issued to sailors in Britain) | - |
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| (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, pigwash, slop, swill |
| slopseller | (noun) a dealer in cheap ready-made clothing | Synonyms: slop-seller |
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| slopshop | (noun) a store that sells cheap ready-made clothing | Synonyms: slopseller's shop |
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| slot | (noun) a small slit (as for inserting a coin or depositing mail) | - |
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| (noun) a slot machine that is used for gambling | Synonyms: one-armed bandit |
| (noun) (computer) a socket in a microcomputer that will accept a plug-in circuit board | Synonyms: expansion slot |
| (noun) a position in a grammatical linguistic construction in which a variety of alternative units are interchangeable | - |
| (noun) the trail of an animal (especially a deer) | - |
| (noun) a position in a hierarchy or organization | - |
| (noun) a time assigned on a schedule or agenda | Synonyms: time slot |
| sloth | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: acedia, laziness |
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| (noun) any of several slow-moving arboreal mammals of South America and Central America; they hang from branches back downward and feed on leaves and fruits | Synonyms: tree sloth |
| (noun) a disinclination to work or exert yourself | Synonyms: slothfulness |
| slothfulness | (noun) a disinclination to work or exert yourself | Synonyms: sloth |
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| slouch | (noun) a stooping carriage in standing and walking | - |
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| (noun) an incompetent person; usually used in negative constructions | - |
| sloucher | (noun) a person who slouches; someone with a drooping carriage | - |
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| slough | (noun) any outer covering that can be shed or cast off (such as the cast-off skin of a snake) | - |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: gangrene, sphacelus |
| (noun) a stagnant swamp (especially as part of a bayou) | - |
| (noun) a hollow filled with mud | - |
| sloughing | (noun) the process whereby something is shed | Synonyms: shedding |
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| sloven | (noun) a coarse obnoxious person | Synonyms: pig, slob, slovenly person |
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| slovenliness | (noun) habitual uncleanliness | - |
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| (noun) a lack of order and tidiness; not cared for | Synonyms: sloppiness, unkemptness |
| slowcoach | (noun) someone who moves slowly | Synonyms: plodder, slowpoke, stick-in-the-mud |
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| slowdown | (noun) the act of slowing down or falling behind | Synonyms: lag, retardation |
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| slowing | (noun) a decrease in rate of change | Synonyms: deceleration, retardation |
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| slowness | (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberateness, deliberation, unhurriedness |
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| (noun) lack of normal development of intellectual capacities | Synonyms: backwardness, mental retardation, retardation, subnormality |
| (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, clumsiness, ineptitude, ineptness, maladroitness |
| slowpoke | (noun) someone who moves slowly | Synonyms: plodder, slowcoach, stick-in-the-mud |
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| slowworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, blindworm |
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| slub | (noun) soft lump or unevenness in a yarn; either an imperfection or created by design | Synonyms: burl, knot |
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| sludge | (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, gunk, muck, ooze, slime |
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| (noun) the precipitate produced by sewage treatment | - |
| slug | (noun) (boxing) a blow with the fist | Synonyms: biff, clout, lick, poke, punch |
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| (noun) any of various terrestrial gastropods having an elongated slimy body and no external shell | - |
| (noun) a projectile that is fired from a gun | Synonyms: bullet |
| (noun) a strip of type metal used for spacing | Synonyms: type slug |
| (noun) an amount of an alcoholic drink (usually liquor) that is poured or gulped | - |
| (noun) an idle slothful person | Synonyms: sluggard |
| (noun) a counterfeit coin | - |
| (noun) a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms | - |
| slugabed | (noun) a person who stays in bed until a relatively late hour | Synonyms: lie-abed |
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| slugfest | (noun) a fight with bare fists | Synonyms: fistfight, fisticuffs |
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| sluggard | (noun) an idle slothful person | Synonyms: slug |
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| slugger | (noun) (baseball) a ballplayer who is batting | Synonyms: batsman, batter, hitter |
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| (noun) a boxer noted for an ability to deliver hard punches | Synonyms: slogger |
| sluggishness | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, lethargy, phlegm |
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| (noun) the pace of things that move relatively slowly | - |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, lethargy |
| sluice | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: penstock, sluiceway |
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| sluicegate | (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: floodgate, head gate, penstock, sluice valve, water gate |
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| sluiceway | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: penstock, sluice |
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| slum | (noun) a district of a city marked by poverty and inferior living conditions | Synonyms: slum area |
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| slumber | (noun) a dormant or quiescent state | - |
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| (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: sleep |
| slumberer | (noun) a rester who is sleeping | Synonyms: sleeper |
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| slumgullion | (noun) a thin stew of meat and vegetables | - |
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| slump | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slack |
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| (noun) a long-term economic state characterized by unemployment and low prices and low levels of trade and investment | Synonyms: depression, economic crisis |
| slumpflation | (noun) a situation in which economic depression is combined with increasing inflation. | - |
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| slur | (noun) a blemish made by dirt | Synonyms: blot, daub, smear, smirch, smudge, spot |
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| (noun) a disparaging remark | Synonyms: aspersion |
| (noun) (music) a curved line spanning notes that are to be played legato | - |
| slurry | (noun) a suspension of insoluble particles (as plaster of Paris or lime or clay etc.) usually in water | - |
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| slush | (noun) partially melted snow | - |
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| slut | (noun) a woman adulterer | Synonyms: adulteress, fornicatress, hussy, jade, loose woman, strumpet, trollop |
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| (noun) a dirty untidy woman | Synonyms: slattern, slovenly woman, trollop |
| (noun) A sexually loose woman | Synonyms: ho, hoe, hussy, trollop |
| sluttishness | (noun) in the manner of a slattern | Synonyms: slatternliness |
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| slyboots | (noun) a shifty deceptive person | Synonyms: dodger, fox |
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| slyness | (noun) shrewdness as demonstrated by being skilled in deception | Synonyms: craft, craftiness, cunning, foxiness, guile, wiliness |
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