| 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 | (noun) flying downward in a helical path with a large radius | - |
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| (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 |
| spirant | (noun) a continuant consonant produced by breath moving against a narrowing of the vocal tract | Synonyms: fricative, fricative consonant |
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| 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 |
| spiritedness | (noun) quality of being active or spirited or alive and vigorous | Synonyms: animation, brio, invigoration, vivification |
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| spiritism | (noun) concern with things of the spirit | Synonyms: otherworldliness, spiritualism, spirituality |
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| spiritlessness | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: apathy, indifference, numbness |
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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 | (noun) a kind of religious song originated by Blacks in the southern United States | Synonyms: Negro spiritual |
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| spiritualisation | (noun) the act of making something spiritual; infusing it with spiritual content | Synonyms: spiritualization |
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| 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 | (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, sensitive |
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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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| spiritualty | (noun) property or income owned by a church | Synonyms: church property, spirituality |
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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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| 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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