| sphacelate | (verb) undergo necrosis | Synonyms: gangrene, mortify, necrose |
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| sphacelus | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, necrosis |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: gangrene, slough |
| sphagnum | (noun) any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat | Synonyms: bog moss, peat moss, sphagnum moss |
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| sphalerite | (noun) an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form | Synonyms: blende, zinc blende |
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| sphecoid | (noun) any of various solitary wasps | Synonyms: sphecoid wasp |
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| sphenion | (noun) the anterior tip of the parietal bone | - |
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| sphenoid | (noun) butterfly-shaped bone at the base of the skull | Synonyms: os sphenoidale, sphenoid bone |
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| sphere | (noun) any spherically shaped artifact | - |
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| (noun) a particular aspect of life or activity | Synonyms: sector |
| (noun) the geographical area in which one nation is very influential | Synonyms: sphere of influence |
| (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected | Synonyms: celestial sphere, empyrean, firmament, heavens, vault of heaven, welkin |
| (noun) a solid figure bounded by a spherical surface (including the space it encloses) | - |
| (noun) a three-dimensional closed surface such that every point on the surface is equidistant from the center | - |
| (noun) a particular environment or walk of life | Synonyms: area, arena, domain, field, orbit |
| spheric | (adjective) having the shape of a sphere or ball | Synonyms: ball-shaped, global, globose, globular, orbicular, spherical |
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| spherical | (adjective) of or relating to spheres or resembling a sphere | - |
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| (adjective) having the shape of a sphere or ball | Synonyms: ball-shaped, global, globose, globular, orbicular, spheric |
| spherically | (adverb) in a spherical manner | - |
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| sphericalness | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundity, rotundness, sphericity |
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| sphericity | (noun) the roundness of a 3-dimensional object | Synonyms: globosity, globularness, rotundity, rotundness, sphericalness |
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| spherocyte | (noun) an abnormal spherical red blood cell | - |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| spheroidal | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoid, ellipsoidal |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| spherule | (noun) a small sphere | - |
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| sphincter | (noun) a ring of muscle that contracts to close an opening | Synonyms: anatomical sphincter, sphincter muscle |
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| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| sphingine | (adjective) resembling a sphinx | - |
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| sphinx | (noun) one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians | - |
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| (noun) an inscrutable person who keeps his thoughts and intentions secret | - |
| sphygmomanometer | (noun) a pressure gauge for measuring blood pressure | - |
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