<B>sulfamic acid,</B><DL COMPACT><DD> a white, crystalline solid obtained by heating urea with sulfuric acid, used for cleaning and electroplating metal, as a fire retardant, and in organic synthesis. </DL>
<A NAME="sulfanilamide">
<B>sulfanilamide, </B>noun.<DL COMPACT><DD> a white, crystalline substance derived from coal tar. It was the first sulfa drug to be widely used in treating various infections. Sulfanilamide is the amide of sulfanilic acid and is the basis for most of the sulfa drugs. </DL>
<A NAME="sulfanilicacid">
<B>sulfanilic acid,</B><DL COMPACT><DD> a grayish-white, crystalline acid produced by heating aniline with sulfuric acid, used especially in the manufacture of dyes. </DL>
<B>sulfapyrazine, </B>noun.<DL COMPACT><DD> a sulfa drug with uses similar to sulfadiazine. </DL>
<A NAME="sulfapyridine">
<B>sulfapyridine, </B>noun.<DL COMPACT><DD> a sulfa drug, of the sulfonamide group, used against certain skin infections and pneumonia, but now superseded for general use by less toxic derivatives. </DL>
<A NAME="sulfaquinoxaline">
<B>sulfaquinoxaline, </B>noun.<DL COMPACT><DD> a synthetic drug used in the treatment of coccidiosis, fowl cholera, dysentery, and other diseases of cattle, sheep, swine, rabbits, and domestic fowl. </DL>
<B>sulfarsenide, </B>noun.<DL COMPACT><DD> (Chemistry.) a compound which is a double salt of sulfur and arsenic. </DL>
<A NAME="sulfarsphenamine">
<B>sulfarsphenamine, </B>noun.<DL COMPACT><DD> a sulfa drug containing arsenic, used in the treatment of syphilis. </DL>
<A NAME="sulfasuxidine">
<B>Sulfasuxidine, </B>noun.<DL COMPACT><DD> (Trademark.) a preparation of succinylsulfathiazole. </DL>
<A NAME="sulfatase">
<B>sulfatase, </B>noun.<DL COMPACT><DD> an enzyme that catalyzes the hydrolysis of esters of sulfuric acid. One kind is commonly found in animal and plant tissues; another is present in bacteria. </DL>
<A NAME="sulfate">
<B>sulfate, </B>noun, verb, <B>-fated,</B> <B>-fating.</B><DL COMPACT><DD><I>noun </I> any salt or ester of sulfuric acid. <BR> <I>Ex. Most sulfates are soluble in water, but such sulfates as barium, strontium, and lead sulfates do not dissolve in water.</I> <DD><I>v.t. </I> <B>1. </B>to combine or treat with sulfuric acid or a sulfate. <DD><B> 2. </B>to change into a sulfate. <DD><B> 3. </B>(Electricity.) to form a scaly deposit of a compound containing lead sulfate on (the plates of a storage battery). <DD><I>v.i. </I> to become sulfated. </DL>
<A NAME="sulfatepaper">
<B>sulfate paper,</B><DL COMPACT><DD> any paper of various grades and types made from pulp produced by the sulfate process, as kraft and other stocks intended for commercial use and certain types of inexpensive typewriter paper. </DL>
<A NAME="sulfateprocess">
<B>sulfate process,</B><DL COMPACT><DD> a papermaking process in which wood chips are converted into pulp by cooking under pressure in a solution of sodium sulfide, sodium hydroxide, and water. </DL>
<A NAME="sulfathiazole">
<B>sulfathiazole, </B>noun.<DL COMPACT><DD> a sulfa drug of the sulfonamide group, used especially in treating gonorrhea and pneumonia, but superseded for general use by sulfadiazine. </DL>
<A NAME="sulfation">
<B>sulfation, </B>noun.<DL COMPACT><DD><B> 1. </B>the act or process of sulfating. <BR> <I>Ex. The additive would ... ward off the harmful effects ... of sulfation in lead-acid storage batteries which causes efficiency to drop off (Wall Street Journal).</I> <DD><B> 2. </B>the scaly deposit formed on the plates of a storage battery by this process. </DL>
<A NAME="sulfatization">
<B>sulfatization, </B>noun.<DL COMPACT><DD> the act or process of sulfatizing. </DL>
<A NAME="sulfatize">
<B>sulfatize, </B>transitive verb, <B>-ized,</B> <B>-izing.</B><DL COMPACT><DD> to change (as sulfide ores) into sulfates, especially by roasting. </DL>
<A NAME="sulfetrone">
<B>sulfetrone, </B>noun.<DL COMPACT><DD> a drug, one of the sulfone compounds, used in the treatment of leprosy. </DL>
<B>sulfisoxazole, </B>noun.<DL COMPACT><DD> a white or yellowish sulfa drug used to treat various bacterial infections, especially infections of the urinary tract. </DL>
<A NAME="sulfite">
<B>sulfite, </B>noun.<DL COMPACT><DD> a salt or ester of sulfurous acid. </DL>
<A NAME="sulfiteprocess">
<B>sulfite process,</B><DL COMPACT><DD> a method of producing wood pulp by cooking wood chips in a solution of bisulfite of calcium, magnesium, sodium, or ammonium. It is used mainly with softwoods, such as fir and hemlock. </DL>
<A NAME="sulfitic">
<B>sulfitic, </B>adjective.<DL COMPACT><DD> of or having to do with a sulfite or sulfites. </DL>
<B>sulfonamide, </B>noun.<DL COMPACT><DD> any one of a group of sulfa drugs, derivatives of sulfanilamide, which check bacterial infections, chiefly by preventing the synthesis in the body of certain substances necessary to the growth of disease-producing bacteria. Their use is governed by factors such as rate of absorption and resistance of the bacteria. Other drugs, such as sodium bicarbonate, are often administered with them to reduce their toxic effects. </DL>
<A NAME="sulfonate">
<B>sulfonate, </B>noun, verb, <B>-nated,</B> <B>-nating.</B><DL COMPACT><DD> (Chemistry.) <DD><I>noun </I> a salt or ester of a sulfonic acid. <DD><I>v.t. </I> to convert into a sulfonic acid. </DL>
<A NAME="sulfonation">
<B>sulfonation, </B>noun.<DL COMPACT><DD> (Chemistry.) the introduction of one or more sulfonic acid radicals into an organic compound. </DL>
<A NAME="sulfone">
<B>sulfone, </B>noun.<DL COMPACT><DD> (Chemistry.) any one of a group of compounds containing a radical composed of one atom of sulfur and two atoms of oxygen, united to two hydrocarbon radicals. <BR> <I>Ex. Widespread use of sulfone drugs has made recovery [from leprosy] increasingly common (Time).</I> </DL>
<A NAME="sulfonicacid">
<B>sulfonic acid,</B><DL COMPACT><DD> any one of a group of organic acids. They are used especially in making phenols, dyes, and drugs. </DL>
<A NAME="sulfonium">
<B>sulfonium, </B>noun.<DL COMPACT><DD> (Chemistry.) a univalent radical formed by the addition of a proton to hydrogen sulfide. </DL>
<A NAME="sulfonmethane">
<B>sulfonmethane, </B>noun.<DL COMPACT><DD> a soluble, white, crystalline substance used as a hypnotic; Sulfonal. </DL>
<A NAME="sulfonyl">
<B>sulfonyl, </B>noun.<DL COMPACT><DD> (Chemistry.) a bivalent radical containing one atom of sulfur and two atoms of oxygen; sulfuryl. </DL>
<B>sulfonylurea, </B>noun.<DL COMPACT><DD> any one of a group of drugs, compounds of sulfonyl and urea, related to the sulfa drugs and used as a substitute for insulin in the treatment of diabetes. </DL>
<A NAME="sulfoxide">
<B>sulfoxide, </B>noun.<DL COMPACT><DD> (Chemistry.) an organic compound containing an -SO group linked to two carbon atoms. </DL>
<A NAME="sulfur">
<B>sulfur, </B>noun, adjective, verb.<DL COMPACT><DD><I>noun </I> <B>1. </B>a light-yellow, nonmetallic chemical element that burns in the air with a blue flame and a stifling odor; brimstone. Sulfur is found abundantly in volcanic regions, occurring free in nature as a brittle, crystalline solid or in combination with metals and other substances, and is also a constituent of proteins. It is used in making matches, gunpowder, paper pulp, fertilizers, medicines, and insecticides, and for vulcanizing rubber and in bleaching. <DD><B> 2. </B>a greenish yellow; sulphur. <DD><I>adj. </I> greenish-yellow; sulphur. <DD><I>v.t. </I> to combine or treat with sulfur; sulfurate. Also, <B>sulphur.</B> </DL>
<A NAME="sulfurate">
<B>sulfurate, </B>verb, <B>-rated,</B> <B>-rating,</B> adjective.<DL COMPACT><DD><I>v.t. </I> to combine, impregnate with, or subject to the action of sulfur or a sulfur compound; sulfurize. <DD><I>adj. </I> <B>1. </B>made of or consisting of sulfur. <DD><B> 2. </B>resembling sulfur. </DL>
<A NAME="sulfuration">
<B>sulfuration, </B>noun.<DL COMPACT><DD><B> 1. </B>the act or process of treating with sulfur. <DD><B> 2. </B>the state of being treated or impregnated with sulfur. </DL>
<A NAME="sulfurator">
<B>sulfurator, </B>noun.<DL COMPACT><DD><B> 1. </B>an apparatus for treating, impregnating, or sprinkling with sulfur. <DD><B> 2. </B>an apparatus for fumigating or bleaching with the fumes of burning sulfur. </DL>
<B>sulfur dioxide,</B><DL COMPACT><DD> a heavy, colorless, poisonous gas or liquid with a sharp odor, used as a bleach, disinfectant, preservative, and refrigerant, and in making sulfuric acid. </DL>
<A NAME="sulfureous">
<B>sulfureous, </B>adjective.<DL COMPACT><DD><B> 1. </B>consisting of or containing sulfur. <DD><B> 2. </B>having to do with sulfur. <DD><B> 3. </B>like sulfur. <DD><B> 4. </B><B>=sulphureous </B>(def. 2). adv. <B>sulfureously.</B> noun <B>sulfureousness.</B> </DL>
<A NAME="sulfuret">
<B>sulfuret, </B>verb, <B>-reted,</B> <B>-reting</B> or (especially British) <B>-retted,</B> <B>-retting,</B> noun.<DL COMPACT><DD><I>v.t. </I> to combine or treat with sulfur. <DD><I>noun </I> (formerly) a sulfide. </DL>
<A NAME="sulfureted">
<B>sulfureted</B> or <B>sulfuretted, </B>adjective.<DL COMPACT><DD><B> 1. </B>combined or treated with sulfur. <DD><B> 2. </B>containing sulfur or a sulfur compound. </DL>
<A NAME="sulfuric">
<B>sulfuric, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with sulfur. <DD><B> 2. </B>containing sulfur, especially with a valence of six. </DL>
<A NAME="sulfuricacid">
<B>sulfuric acid,</B><DL COMPACT><DD> a heavy, oily, colorless, and very corrosive acid derived from sulfur; oil of vitriol; vitriol. Sulfuric acid is used in making explosives and fertilizers, in refining petroleum, and in many other industrial processes. </DL>
