<B>thinking, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>1. </B>that thinks; reasoning. <BR> <I>Ex. Whatever withdraws us from the power of our senses ... advances us in the dignity of thinking beings (Samuel Johnson).</I> <DD><B> 2. </B>given to thinking; thoughtful or reflective. <DD><I>noun </I> mental action or activity; thought. <BR> <I>Ex. Thinking ... in its higher forms ... is a kind of poetry (Havelock Ellis).</I> (SYN) contemplative, pensive, cogitative. adv. <B>thinkingly.</B> </DL>
<A NAME="thinkingcap">
<B>thinking cap,</B><BR><I>expr. <B>put on one's thinking cap,</B> </I>to take time for thinking over something. <BR> <I>Ex. No expense has been spared; clearly everyone connected with the enterprise put on his thinking cap, and thought big (New Yorker).</I> </DL>
<B>think piece,</B><DL COMPACT><DD> a magazine or newspaper article devoted to an extensive analysis or discussion of current news. </DL>
<A NAME="thinktank">
<B>think tank,</B><DL COMPACT><DD> (Informal.) a center or institute for theoretical studies and research in solving problems of society, science, and technology; think factory. <BR> <I>Ex. The Urban Institute was set up by the Johnson Administration as a private, nonprofit corporation to serve as the Government's "think tank" for research into city problems (New York Times).</I> </DL>
<A NAME="thinktanker">
<B>think-tanker, </B>noun.<DL COMPACT><DD> a member of a think tank. </DL>
<A NAME="thinlayerchromatography">
<B>thin-layer chromatography,</B><DL COMPACT><DD> a method of analyzing the chemical substances of a mixture by passing it through a thin layer of filtering material. </DL>
<A NAME="thinner">
<B>thinner, </B>noun.<DL COMPACT><DD><B> 1. </B>a liquid, especially turpentine, used to make paint more fluid. <DD><B> 2. </B>a person or thing that thins. </DL>
<A NAME="thinning">
<B>thinning, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> that thins. <BR> <I>Ex. thinning hair.</I> <DD><I>noun </I> a decrease in thickness, closeness, density, or amount. <BR><I>expr. <B>thinnings,</B> </I>slivers, particles, or shavings, removed in decreasing the thickness of wood or the like. <BR> <I>Ex. ... a fir paling of the horizontal kind, made from the thinnings of trees of that kind (R. W. Dickson).</I> </DL>
<B>thin-skinned, </B>adjective.<DL COMPACT><DD><B> 1. </B>having a thin skin or rind. <BR> <I>Ex. a thin-skinned orange.</I> <DD><B> 2. </B>(Figurative.) sensitive to criticism, reproach, rebuff, or the like; touchy. <BR> <I>Ex. When [the author] gets after the Americans the amusement turns sour and not, one thinks, because an American reader is necessarily thin-skinned (Wall Street Journal).</I> </DL>
<A NAME="thio">
<B>thio-,</B><DL COMPACT><DD> (combining form.) sulfur (replacing oxygen atoms in the designated oxygen compound) as in <I>thioarsenate, thiocyanate.</I> Also, sometimes <B>thi-</B> before vowels. </DL>
<A NAME="thioaceticacid">
<B>thioacetic acid,</B><DL COMPACT><DD> a liquid produced by heating glacial acetic acid with a sulfide of phosphorus, used as a reagent. </DL>
<A NAME="thioacid">
<B>thioacid, </B>noun.<DL COMPACT><DD> an acid in which sulfur partly or wholly takes the place of oxygen. </DL>
<A NAME="thioaldehyde">
<B>thioaldehyde, </B>noun.<DL COMPACT><DD> any compound of a group produced by treating aldehydes with hydrogen sulfides, and considered as aldehydes withsulfur substituted for the oxygen. </DL>
<A NAME="thioarsenate">
<B>thioarsenate, </B>noun.<DL COMPACT><DD> a salt of a thioarsenic acid. </DL>
<A NAME="thioarsenicacid">
<B>thioarsenic acid,</B>,<DL COMPACT><DD> any one of a group of acids existing only in the form of their salts. </DL>
<A NAME="thioarseniousacid">
<B>thioarsenious acid,</B><DL COMPACT><DD> any one of a group of hypothetical acids. </DL>
<A NAME="thioarsenite">
<B>thioarsenite, </B>noun.<DL COMPACT><DD> a salt of a thioarsenious acid. </DL>
<B>thioctic acid,</B><DL COMPACT><DD> one of the vitamins of the vitamin B complex, important in releasing sugar for conversion into energy, and in the proper functioning of the liver; lipoic acid. </DL>
<A NAME="thiocyanate">
<B>thiocyanate, </B>noun.<DL COMPACT><DD> a salt or ester of thiocyanic acid, containing the radical -SCN. </DL>
<A NAME="thiocyanicacid">
<B>thiocyanic acid,</B><DL COMPACT><DD> a colorless, unstable liquid with a penetrating odor. </DL>
<A NAME="thioguanine">
<B>thioguanine, </B>noun.<DL COMPACT><DD> a drug that retards the growth of cells, used in the treatment of certain forms of cancer. </DL>
<A NAME="thiokol">
<B>Thiokol, </B>noun.<DL COMPACT><DD> (Trademark.) any of a group of synthetic rubbers produced from organic halides and metallic polysulfides, especially resistant to gasoline, oils, and typical organic solvents. </DL>
<A NAME="thiol">
<B>thiol, </B>noun.<DL COMPACT><DD><B> 1. </B>any organic compound of a series resembling the alcohols and phenols, but containing sulfur in place of oxygen; mercaptan. <DD><B> 2. </B>the univalent radical -SH; sulfhydryl. </DL>
<A NAME="thiolaceticacid">
<B>thiolacetic acid, =thioacetic acid.</B></DL>
<A NAME="thionate">
<B>thionate, </B>noun.<DL COMPACT><DD> a salt or ester of a thionic acid. </DL>
<A NAME="thionic">
<B>thionic, </B>adjective.<DL COMPACT><DD> (Chemistry.) <DD><B> 1. </B>of or containing sulfur. <DD><B> 2. </B>having oxygen replaced by sulfur. </DL>
<A NAME="thionin">
<B>thionin, </B>noun. <B>=thionine.</B></DL>
<A NAME="thionine">
<B>thionine, </B>noun.<DL COMPACT><DD><B> 1. </B>a dark crystalline, basic compound derived from thiazine, used as a violet stain in microscopy. <DD><B> 2. </B>any of several allied dyes. </DL>
<A NAME="thionyl">
<B>thionyl, </B>noun.<DL COMPACT><DD> a bivalent inorganic radical -SO; sulfinyl. </DL>
<A NAME="thiopentalsodium">
<B>thiopental sodium,</B><DL COMPACT><DD> a yellowish-white barbiturate similar to pentobarbital sodium, used as an anesthetic; Pentothal Sodium; sodium pentothal. </DL>
<B>thiophene, </B>noun.<DL COMPACT><DD> a colorless liquid compound, present in coal tar, with an odor like that of benzene, and with properties similar to those of benzene. </DL>
<A NAME="thiophenol">
<B>thiophenol, </B>noun.<DL COMPACT><DD> a colorless mobile liquid with the odor of garlic, regarded as phenol with the oxygen replaced by sulfur. </DL>
<A NAME="thiophosphate">
<B>thiophosphate, </B>noun.<DL COMPACT><DD> a salt or ester of thiophosphoric acid. </DL>
<A NAME="thiophosphoricacid">
<B>thiophosphoric acid,</B><DL COMPACT><DD> an acid produced from phosphoric acid by replacing one or more oxygen atoms with an atom of sulfur. </DL>
<A NAME="thioridazine">
<B>thioridazine, </B>noun.<DL COMPACT><DD> a drug used as a tranquilizer, especially in the treatment of schizophrenia and senility. </DL>
<A NAME="thiosemicarbazone">
<B>thiosemicarbazone, </B>noun.<DL COMPACT><DD> a toxic, pale-yellow, crystalline compound, used in treating leprosy and pulmonary tuberculosis. </DL>
<A NAME="thiosinamine">
<B>thiosinamine, </B>noun.<DL COMPACT><DD> a colorless crystalline compound having a garlicky odor, produced by heating mustard oil and alcohol with ammonia. It is used in medicine and in photography. </DL>
<A NAME="thiosulfate">
<B>thiosulfate, </B>noun.<DL COMPACT><DD> a salt or ester of thiosulfuric acid. </DL>
<A NAME="thiosulfuricacid">
<B>thiosulfuric acid,</B><DL COMPACT><DD> an unstable acid, considered as sulfuric acid in which one atom of oxygen is replaced by sulfur. It occurs only in solution or in the form of its salts (thiosulfates). </DL>
<A NAME="thiotepa">
<B>thioTEPA</B> or <B>thiotepa, </B>noun.<DL COMPACT><DD> a crystalline drug derived from nitrogen mustard, used in arresting the growth of cancerous tissue by inhibiting cell division, as in the alleviation of leukemia. </DL>
<A NAME="thiouracil">
<B>thiouracil, </B>noun.<DL COMPACT><DD> a white crystalline powder used in treating hyperthyroidism. </DL>
<A NAME="thiourea">
<B>thiourea, </B>noun.<DL COMPACT><DD> a bitter, colorless crystalline substance, considered as urea with sulfur substituted for the oxygen; thiocarbamide. It is used especially in photography. </DL>
<B>thiram, </B>noun.<DL COMPACT><DD> a white crystalline compound used as a fungicide, seed disinfectant, and bacteriostat. </DL>
<A NAME="third">
<B>third, </B>adjective, noun, verb.<DL COMPACT><DD><I>adj. </I> <B>1. </B>next after the second; last in a series of three. <BR> <I>Ex. C is the third letter of the alphabet.</I> <DD><B> 2. </B>being one of three equal parts. <DD><B> 3. </B>(U.S.) of, having to do with, or designating the gear used for ordinary driving in an automobile with a standard transmission; high. <BR> <I>Ex. to shift into third gear.</I> <DD><I>noun </I> <B>1. </B>the next after the second; last in a series of three. <DD><B> 2. </B>one of three equal parts into which a unit or total may be divided. <BR> <I>Ex. Mother divided the cake into thirds.</I> <DD><B> 3. </B>the third of the subdivisions of any standard measure or dimension that is successively subdivided in a constant ratio; subdivision next below seconds. <DD><B> 4. </B>(Music.) <DD><B> a. </B>a tone or note three diatonic degrees from a given tone or note. <DD><B> b. </B>the interval of two tones between such tones or notes. <DD><B> c. </B>the harmonic combination of such tones or notes. <DD><B> d. </B>the third tone or note of a scale, three diatonic degrees above the tonic; mediant. <DD><B> 5. </B>(U.S.) third gear; high. <DD><I>v.t. </I> <B>1. </B>to divide (anything) into three equal parts; reduce to one third the number or bulk. <DD><B> 2. </B>to speak in favor of (a motion, proposition, or the like) as third speaker; support the seconder. <BR> <I>Ex. A motion of the lord Wharton, seconded and thirded by the lords Somers and Halifax (N. Luttrell).</I> <BR>expr. <B>thirds,</B> <DD><B> a. </B>one third of the property of a deceased husband, to which the widow is entitled if there is a child or children. <DD><B> b. </B>a widow's dower. </DL>
