| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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| asparaginase | (noun) antineoplastic drug (trade name Elspar) sometimes used to treat lymphoblastic leukemia | Synonyms: Elspar |
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| asparagine | (noun) a crystalline amino acid found in proteins and in many plants (e.g., asparagus) | - |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| bispak | (noun) A sexually promiscuous Indonesian woman | - |
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| blepharospasm | (noun) spasm of the eyelid muscle resulting in closure of the eye | - |
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| bronchospasm | (noun) a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis | - |
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| cardiospasm | (noun) a spasm of the cardiac sphincter (between the esophagus and the stomach); if the cardiac sphincter does not relax during swallowing the passage of food into the stomach is obstructed | - |
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| caspase | (noun) any of a group of proteases that mediate apoptosis | - |
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| crawlspace | (noun) low space beneath a floor of a building; gives workers access to wiring or plumbing | Synonyms: crawl space |
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| crosspatch | (noun) a bad-tempered person | Synonyms: churl, crank, grouch, grump |
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| cyberspace | (noun) a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange | Synonyms: internet, net |
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| despair | (noun) the feeling that everything is wrong and nothing will turn out well | - |
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| (noun) a state in which all hope is lost or absent | Synonyms: desperation |
| despatch | (noun) the act of sending off something | Synonyms: dispatch, shipment |
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| (noun) killing a person or animal | Synonyms: dispatch |
| (noun) the property of being prompt and efficient | Synonyms: dispatch, expedition, expeditiousness |
| (noun) an official report (usually sent in haste) | Synonyms: communique, dispatch |
| disparagement | (noun) the act of speaking contemptuously of | Synonyms: dispraise |
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| (noun) a communication that belittles somebody or something | Synonyms: depreciation, derogation |
| disparager | (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, detractor, knocker |
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| disparateness | (noun) utter dissimilarity | Synonyms: distinctiveness |
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| disparity | (noun) inequality or difference in some respect | - |
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| dispassion | (noun) objectivity and detachment | Synonyms: dispassionateness, dryness |
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| dispassionateness | (noun) objectivity and detachment | Synonyms: dispassion, dryness |
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| dispatch | (noun) the act of sending off something | Synonyms: despatch, shipment |
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| (noun) killing a person or animal | Synonyms: despatch |
| (noun) the property of being prompt and efficient | Synonyms: despatch, expedition, expeditiousness |
| (noun) an official report (usually sent in haste) | Synonyms: communique, despatch |
| dispatcher | (noun) the official who signals the beginning of a race or competition | Synonyms: starter |
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| (noun) employee of a transportation company who controls the departures of vehicles according to weather conditions and in the interest of efficient service | - |
| epispadias | (noun) a congenital abnormality in males in which the urethra is on the upper surface of the penis | - |
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| espadrille | (noun) a sandal with a sole made of rope or rubber and a cloth upper part | - |
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| espalier | (noun) a trellis on which ornamental shrub or fruit tree is trained to grow flat | - |
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| esparcet | (noun) Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain | Synonyms: holy clover, Onobrychis viciaefolia, Onobrychis viciifolia, sainfoin, sanfoin |
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| feldspar | (noun) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium | Synonyms: felspar |
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| felspar | (noun) any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium | Synonyms: feldspar |
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| fluorspar | (noun) a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | Synonyms: fluor, fluorite |
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| graphospasm | (noun) muscular spasms of thumb and forefinger while writing with a pen or pencil | Synonyms: writer's cramp |
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| graspability | (noun) The quality of being able to be understood or comprehended; understandability. | - |
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| headspace | (noun) the volume left at the top of a filled container (bottle or jar or tin) before sealing | - |
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| hypospadias | (noun) an abnormal condition in males in which the urethra opens on the under surface of the penis | - |
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| laryngospasm | (noun) a closure of the larynx that blocks the passage of air to the lungs | - |
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| lifespan | (noun) the period during which something is functional (as between birth and death) | Synonyms: life-time, life, lifetime |
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| newspaper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: paper |
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| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: paper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper publisher, paper |
| (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newsprint |
| newspapering | (noun) journalism practiced for the newspapers | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| paspalum | (noun) tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States | Synonyms: dallis grass, dallisgrass, Paspalum dilatatum |
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| semitransparency | (noun) the quality of allowing light to pass diffusely | Synonyms: translucence, translucency |
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| spa | (noun) a fashionable hotel usually in a resort area | Synonyms: resort hotel |
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| (noun) a place of business with equipment and facilities for exercising and improving physical fitness | Synonyms: health club, health spa |
| (noun) a health resort near a spring or at the seaside | Synonyms: watering hole, watering place |
| space | (noun) the unlimited expanse in which everything is located | Synonyms: infinite |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: quad |
| (noun) a blank character used to separate successive words in writing or printing | Synonyms: blank |
| (noun) a blank area | Synonyms: blank space, place |
| (noun) one of the areas between or below or above the lines of a musical staff | - |
| (noun) an area reserved for some particular purpose | - |
| (noun) any location outside the Earth's atmosphere | Synonyms: outer space |
| (noun) an empty area (usually bounded in some way between things) | - |
| (noun) the interval between two times | Synonyms: distance |
| spacecraft | (noun) a craft capable of traveling in outer space; technically, a satellite around the sun | Synonyms: ballistic capsule, space vehicle |
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| spacefaring | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spaceflight |
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| spaceflight | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spacefaring |
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| spaceman | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, cosmonaut |
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| spaceship | (noun) a spacecraft designed to carry a crew into interstellar space (especially in science fiction) | Synonyms: starship |
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| spacesuit | (noun) a pressure suit worn by astronauts while in outer space | - |
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| spacewalker | (noun) an astronaut who is active outside a spacecraft in outer space | - |
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| spacing | (noun) the property possessed by an array of things that have space between them | Synonyms: spatial arrangement |
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| (noun) the time between occurrences of a repeating event | - |
| spaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, roominess |
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| spackle | (noun) powder (containing gypsum plaster and glue) that when mixed with water forms a plastic paste used to fill cracks and holes in plaster | Synonyms: spackling compound |
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| spade | (noun) a sturdy hand shovel that can be pushed into the earth with the foot | - |
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| (noun) a playing card in the major suit that has one or more black figures on it | - |
| spadefish | (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: angelfish, Chaetodipterus faber |
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| spadefoot | (noun) a burrowing toad of the Northern Hemisphere with a horny spade-like projection on each hind foot | Synonyms: spadefoot toad |
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| spadeful | (noun) the quantity a shovel can hold | Synonyms: shovel, shovelful |
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| spadework | (noun) dull or routine preliminary work preparing for an undertaking | - |
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| spadix | (noun) the fleshy axis of a spike often surrounded by a spathe | - |
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| spaghetti | (noun) pasta in the form of long strings | - |
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| (noun) spaghetti served with a tomato sauce | - |
| spaghettini | (noun) thin spaghetti | - |
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| spall | (noun) a fragment broken off from the edge or face of stone or ore and having at least one thin edge | Synonyms: spawl |
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| spallation | (noun) (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles | - |
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| spam | (noun) unwanted e-mail (usually of a commercial nature sent out in bulk) | Synonyms: junk e-mail |
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| spammer | (noun) someone who sends unwanted email (often in bulk) | - |
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| span | (noun) the act of sitting or standing astride | Synonyms: straddle |
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| (noun) a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc. | Synonyms: bridge |
| (noun) the distance or interval between two points | - |
| (noun) a unit of length based on the width of the expanded human hand (usually taken as 9 inches) | - |
| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, duo, dyad, pair, twain, twosome, yoke |
| (noun) the complete duration of something | - |
| spandex | (noun) an elastic synthetic fabric | - |
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| spandrel | (noun) an approximately triangular surface area between two adjacent arches and the horizontal plane above them | Synonyms: spandril |
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| spandril | (noun) an approximately triangular surface area between two adjacent arches and the horizontal plane above them | Synonyms: spandrel |
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| spangle | (noun) adornment consisting of a small piece of shiny material used to decorate clothing | Synonyms: diamante, sequin |
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| spaniel | (noun) any of several breeds of small to medium-sized gun dogs with a long silky coat and long frilled ears | - |
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| spank | (noun) a slap with the flat of the hand | - |
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| spanker | (noun) a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel | - |
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| (noun) a hitter who slaps (usually another person) with an open hand | Synonyms: slapper |
| spanking | (noun) the act of slapping on the buttocks | - |
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| spanner | (noun) a hand tool that is used to hold or twist a nut or bolt | Synonyms: wrench |
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| spar | (noun) making the motions of attack and defense with the fists and arms; a part of training for a boxer | Synonyms: sparring |
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| (noun) a stout rounded pole of wood or metal used to support rigging | - |
| (noun) any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable | - |
| spare | (noun) a score in tenpins; knocking down all ten after rolling two balls | - |
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| (noun) an extra car wheel and tire for a four-wheel vehicle | Synonyms: fifth wheel |
| (noun) an extra component of a machine or other apparatus | Synonyms: spare part |
| spareness | (noun) the property of being scanty or scattered; lacking denseness | Synonyms: sparseness, sparsity, thinness |
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| (noun) the property of having little body fat | Synonyms: leanness, thinness |
| sparer | (noun) someone who refrains from injuring or destroying | - |
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| sparerib | (noun) a cut of pork ribs with much of the meat trimmed off | - |
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| spareribs | (noun) cut of pork from the rib section with most of the meat trimmed off | - |
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| (noun) baked or roasted with a spicy sauce | Synonyms: barbecued spareribs |
| sparge | (noun) the act of sprinkling or splashing water | Synonyms: sprinkle, sprinkling |
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| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| spark | (noun) merriment expressed by a brightness or gleam or animation of countenance | Synonyms: light, sparkle, twinkle |
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| (noun) a momentary flash of light | Synonyms: flicker, glint |
| (noun) a small fragment of a burning substance thrown out by burning material or by friction | - |
| (noun) electrical conduction through a gas in an applied electric field | Synonyms: arc, discharge, electric arc, electric discharge |
| (noun) a small but noticeable trace of some quality that might become stronger | - |
| sparker | (noun) a wire net to stop sparks from an open fireplace or smokestack | Synonyms: spark arrester |
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| sparkle | (noun) the quality of shining with a bright reflected light | Synonyms: glisten, glister, glitter, scintillation |
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| (noun) merriment expressed by a brightness or gleam or animation of countenance | Synonyms: light, spark, twinkle |
| (noun) the occurrence of a small flash or spark | Synonyms: coruscation, glitter |
| sparkleberry | (noun) shrub or small tree of eastern United States having black inedible berries | Synonyms: farkleberry, Vaccinium arboreum |
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| sparkler | (noun) a firework that burns slowly and throws out a shower of sparks | - |
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| (noun) diamonds | Synonyms: ice |
| sparkling | (noun) a rapid change in brightness; a brief spark or flash | Synonyms: scintillation, twinkle |
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| sparling | (noun) the common smelt of Europe | Synonyms: European smelt, Osmerus eperlanus |
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| (noun) common smelt of Europe | Synonyms: European smelt |
| sparring | (noun) making the motions of attack and defense with the fists and arms; a part of training for a boxer | Synonyms: spar |
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| (noun) an argument in which the participants are trying to gain some advantage | - |
| sparrow | (noun) any of several small dull-colored singing birds feeding on seeds or insects | Synonyms: true sparrow |
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| (noun) small brownish European songbird | Synonyms: dunnock, hedge sparrow, Prunella modularis |
| sparseness | (noun) the property of being scanty or scattered; lacking denseness | Synonyms: spareness, sparsity, thinness |
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| sparsity | (noun) the property of being scanty or scattered; lacking denseness | Synonyms: spareness, sparseness, thinness |
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| spasm | (noun) (pathology) sudden constriction of a hollow organ (as a blood vessel) | - |
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| (noun) a painful and involuntary muscular contraction | Synonyms: cramp, muscle spasm |