| 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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