| sulcate | (adjective) having deep narrow furrows or grooves | - |
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| sulcus | (noun) (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain | - |
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| sulfa | (noun) antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA | Synonyms: sulfa drug, sulfonamide, sulpha |
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| sulfacetamide | (noun) a topical sulfonamide (trade name Sulamyd) used to treat eye infections | Synonyms: Sulamyd |
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| sulfadiazine | (noun) a sulfa drug used in treating meningitis and pneumonia and other infections | - |
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| sulfamethazine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamezathine |
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| sulfamethoxazole | (noun) a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract) | Synonyms: Gantanol |
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| sulfamezathine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamethazine |
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| sulfanilamide | (noun) a white odorless crystalline sulfa drug; the parent compound of most of the sulfa drugs | - |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| sulfate | (noun) a salt or ester of sulphuric acid | Synonyms: sulphate |
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| (verb) convert into a sulfate | - |
| sulfide | (noun) a compound of sulphur and some other element that is more electropositive | Synonyms: sulphide |
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| sulfisoxazole | (noun) a sulfonamide (trade name Gantrisin) used to treat infections of the urinary tract | Synonyms: Gantrisin |
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| sulfonamide | (noun) antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA | Synonyms: sulfa, sulfa drug, sulpha |
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| sulfonate | (noun) a salt of sulphonic acid | - |
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| sulfonylurea | (noun) antidiabetic consisting of any of several drugs that reduce the level of glucose in the blood; used to treat diabetes mellitus | - |
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| sulfur | (noun) an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions) | Synonyms: atomic number 16, S, sulphur |
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| (verb) treat with sulphur in order to preserve | Synonyms: sulphur |
| sulfurette | (verb) combine with sulfur | Synonyms: sulphurette |
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| sulfuretted | (adjective) treated or impregnated with sulfur | Synonyms: sulfurized, sulphuretted |
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| sulfuric | (adjective) of or relating to or containing sulfur | Synonyms: sulphuric |
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| sulfurized | (adjective) treated or impregnated with sulfur | Synonyms: sulfuretted, sulphuretted |
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| sulfurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulphurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulphurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulphurous, virulent, vitriolic |
| sulindac | (noun) a nonsteroidal anti-inflammatory drug (trade name Clinoril) | Synonyms: Clinoril |
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| sulk | (noun) a mood or display of sullen aloofness or withdrawal | Synonyms: sulkiness |
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| (verb) be in a huff and display one's displeasure | Synonyms: brood, pout |
| sulkily | (adverb) in a sulky manner | - |
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| sulkiness | (noun) a sullen moody resentful disposition | Synonyms: moroseness, sourness, sullenness |
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| (noun) a feeling of sulky resentment | Synonyms: huffishness |
| (noun) a mood or display of sullen aloofness or withdrawal | Synonyms: sulk |
| sulky | (adjective) depressingly dark | Synonyms: gloomful, glooming, gloomy |
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| (adjective) sullen or moody | Synonyms: huffish |
| (adjective) slow or slothful | Synonyms: sluggish |
| (noun) a light two-wheeled vehicle for one person; drawn by one horse | - |
| sulla | (noun) perennial of southern Europe cultivated for forage and for its nectar-rich pink flowers that make it an important honey crop | Synonyms: French honeysuckle, Hedysarum coronarium |
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| sullen | (adjective) darkened by clouds | Synonyms: heavy, lowering, threatening |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, saturnine, sour |
| sullenly | (adverb) in a sullen manner | Synonyms: dourly, glumly |
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| sullenness | (noun) a sullen moody resentful disposition | Synonyms: moroseness, sourness, sulkiness |
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| (noun) a gloomy ill-tempered feeling | Synonyms: glumness, moroseness |
| sully | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: asperse, besmirch, calumniate, defame, denigrate, slander, smear, smirch |
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| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, maculate, stain, tarnish |
| (verb) place under suspicion or cast doubt upon | Synonyms: cloud, corrupt, defile, taint |
| sulpha | (noun) antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA | Synonyms: sulfa, sulfa drug, sulfonamide |
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| sulphate | (noun) a salt or ester of sulphuric acid | Synonyms: sulfate |
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| sulphide | (noun) a compound of sulphur and some other element that is more electropositive | Synonyms: sulfide |
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| sulphur | (noun) an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions) | Synonyms: atomic number 16, S, sulfur |
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| (verb) treat with sulphur in order to preserve | Synonyms: sulfur |
| sulphurette | (verb) combine with sulfur | Synonyms: sulfurette |
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| sulphuretted | (adjective) treated or impregnated with sulfur | Synonyms: sulfuretted, sulfurized |
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| sulphuric | (adjective) of or relating to or containing sulfur | Synonyms: sulfuric |
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| sulphurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulfurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulfurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, virulent, vitriolic |
| sultan | (noun) the ruler of a Muslim country (especially of the former Ottoman Empire) | Synonyms: grand Turk |
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| sultana | (noun) dried seedless grape | Synonyms: seedless raisin |
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| (noun) pale yellow seedless grape used for raisins and wine | - |
| sultanate | (noun) country or territory ruled by a sultan | - |
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| sultrily | (adverb) in a sultry and sensual manner | Synonyms: sensually |
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| sultriness | (noun) the quality of expressing or arousing sexual desire | - |
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| (noun) oppressively hot and humid weather | - |
| sultry | (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulfurous, sulphurous |
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| (adjective) sexually exciting or gratifying | Synonyms: sensual |