| spiracle | (noun) a breathing orifice | - |
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| spiraea | (noun) any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers | Synonyms: spirea |
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| (noun) a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming | Synonyms: Astilbe japonica, spirea |
| spiral | (adjective) in the shape of a coil | Synonyms: coiling, helical, spiraling, spiralling, turbinate, volute, voluted, whorled |
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| (noun) flying downward in a helical path with a large radius | - |
| (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: coil, helix, volute, whorl |
| (noun) ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center | Synonyms: volute |
| (noun) a continuously accelerating change in the economy | - |
| (noun) a plane curve traced by a point circling about the center but at increasing distances from the center | - |
| (noun) a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle | Synonyms: helix |
| (verb) to wind or move in a spiral course | Synonyms: coil, gyrate |
| (verb) move in a spiral or zigzag course | Synonyms: corkscrew |
| (verb) form a spiral | - |
| spiraling | (adjective) in the shape of a coil | Synonyms: coiling, helical, spiral, spiralling, turbinate, volute, voluted, whorled |
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| spiralling | (adjective) in the shape of a coil | Synonyms: coiling, helical, spiral, spiraling, turbinate, volute, voluted, whorled |
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| spirally | (adverb) with spirals | - |
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| spirant | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, fricative, sibilant, strident |
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| (noun) a continuant consonant produced by breath moving against a narrowing of the vocal tract | Synonyms: fricative, fricative consonant |
| spire | (noun) a tall tower that forms the superstructure of a building (usually a church or temple) and that tapers to a point at the top | Synonyms: steeple |
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| spirea | (noun) any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers | Synonyms: spiraea |
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| (noun) a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming | Synonyms: Astilbe japonica, spiraea |
| spirilla | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirillum |
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| spirillum | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirilla |
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| (noun) spirally twisted elongate rodlike bacteria usually living in stagnant water | - |
| spirit | (noun) a fundamental emotional and activating principle determining one's character | - |
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| (noun) animation and energy in action or expression | Synonyms: life, liveliness, sprightliness |
| (noun) an inclination or tendency of a certain kind | Synonyms: heart |
| (noun) the intended meaning of a communication | Synonyms: intent, purport |
| (noun) any incorporeal supernatural being that can become visible (or audible) to human beings | Synonyms: disembodied spirit |
| (noun) the vital principle or animating force within living things | - |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, flavour, look, smell, tone |
| (noun) the state of a person's emotions (especially with regard to pleasure or dejection) | Synonyms: emotional state |
| (verb) infuse with spirit | Synonyms: inspirit, spirit up |
| spirited | (adjective) displaying animation, vigor, or liveliness | - |
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| (adjective) made lively or spirited | Synonyms: enlivened |
| (adjective) willing to face danger | Synonyms: game, gamey, gamy, gritty, mettlesome, spunky |
| (adjective) marked by lively action | Synonyms: bouncing, bouncy, peppy, zippy |
| spiritedly | (adverb) in a spirited or lively manner; with animation and vivacity | - |
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| spiritedness | (noun) quality of being active or spirited or alive and vigorous | Synonyms: animation, brio, invigoration, vivification |
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| spiritise | (verb) imbue with a spirit | Synonyms: spiritize |
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| spiritism | (noun) concern with things of the spirit | Synonyms: otherworldliness, spiritualism, spirituality |
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| spiritize | (verb) imbue with a spirit | Synonyms: spiritise |
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| spiritless | (adjective) lacking ardor or vigor or energy | - |
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| (adjective) evidencing little spirit or courage; overly submissive or compliant | Synonyms: meek |
| spiritlessness | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: apathy, indifference, numbness |
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| spiritous | (adjective) containing or of the nature of alcohol | Synonyms: spirituous |
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| spirits | (noun) an alcoholic beverage that is distilled rather than fermented | Synonyms: booze, hard drink, hard liquor, John Barleycorn, liquor, strong drink |
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| spiritual | (adjective) lacking material body or form or substance | - |
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| (adjective) concerned with sacred matters or religion or the church | Synonyms: religious |
| (adjective) resembling or characteristic of a phantom | Synonyms: apparitional, ghostlike, ghostly, phantasmal, spectral |
| (adjective) concerned with or affecting the spirit or soul | Synonyms: unearthly |
| (noun) a kind of religious song originated by Blacks in the southern United States | Synonyms: Negro spiritual |
| spiritualisation | (noun) the act of making something spiritual; infusing it with spiritual content | Synonyms: spiritualization |
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| spiritualise | (verb) purify from the corrupting influences of the world | Synonyms: spiritualize |
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| (verb) give a spiritual meaning to; read in a spiritual sense | Synonyms: spiritualize |
| spiritualism | (noun) concern with things of the spirit | Synonyms: otherworldliness, spiritism, spirituality |
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| (noun) the belief that the spirits of dead people can communicate with people who are still alive (especially via a medium) | - |
| (noun) (theology) any doctrine that asserts the separate existence of God | - |
| spiritualist | (adjective) of or relating to or connected with spiritualism | Synonyms: spiritualistic |
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| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, sensitive |
| spiritualistic | (adjective) of or relating to or connected with spiritualism | Synonyms: spiritualist |
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| spirituality | (noun) concern with things of the spirit | Synonyms: otherworldliness, spiritism, spiritualism |
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| (noun) property or income owned by a church | Synonyms: church property, spiritualty |
| spiritualization | (noun) the act of making something spiritual; infusing it with spiritual content | Synonyms: spiritualisation |
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| spiritualize | (verb) purify from the corrupting influences of the world | Synonyms: spiritualise |
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| (verb) elevate or idealize, in allusion to Christ's transfiguration | Synonyms: glorify, transfigure |
| (verb) give a spiritual meaning to; read in a spiritual sense | Synonyms: spiritualise |
| spiritually | (adverb) in a spiritual manner | - |
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| spiritualty | (noun) property or income owned by a church | Synonyms: church property, spirituality |
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| spirituous | (adjective) containing or of the nature of alcohol | Synonyms: spiritous |
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| spirochaete | (noun) parasitic or free-living bacteria; many pathogenic to humans and other animals | Synonyms: spirochete |
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| spirochete | (noun) parasitic or free-living bacteria; many pathogenic to humans and other animals | Synonyms: spirochaete |
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| spirogram | (noun) a recording of breathing made with a spirograph | - |
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| spirograph | (noun) a measuring instrument for recording the depth and rapidity of breathing movements | - |
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| spirogyra | (noun) freshwater algae consisting of minute filaments containing spiral chlorophyll bands | - |
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| spirometer | (noun) a measuring instrument for measuring the vital capacity of the lungs | - |
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| spirometry | (noun) the use of a spirometer to measure vital capacity | - |
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| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| spirt | (noun) the occurrence of a sudden discharge (as of liquid) | Synonyms: jet, spurt, squirt |
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| (verb) move or act with a sudden increase in speed or energy | Synonyms: forge, spurt |
| (verb) gush forth in a sudden stream or jet | Synonyms: gush, spout, spurt |
| spirula | (noun) a small tropical cephalopod of the genus Spirula having prominent eyes and short arms and a many-chambered shell coiled in a flat spiral | Synonyms: Spirula peronii |
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