<B>derailer, </B>noun.<DL COMPACT><DD> a person or thing that derails. </DL>
<A NAME="derailleur">
<B>derailleur, </B>noun.<DL COMPACT><DD><B> 1. </B>a device on a bicycle which moves the chain from one gearwheel to another; bicycle gearshift. <DD><B> 2. </B>a bicycle equipped with a derailleur. </DL>
<A NAME="derailment">
<B>derailment, </B>noun.<DL COMPACT><DD> the act of derailing or condition of being derailed. <BR> <I>Ex. The train's speed at derailment was at least 57 m.p.h. (London Times).</I> </DL>
<A NAME="derange">
<B>derange, </B>transitive verb, <B>-ranged,</B> <B>-ranging.</B><DL COMPACT><DD><B> 1. </B>to disturb the order or arrangement of; throw into confusion. <BR> <I>Ex. Sudden illness in the family deranged plans for the trip. She had run for the nearest doctor in the middle of the night, but he was not a man to derange himself (New Yorker).</I> (SYN) disorder, disarrange. <DD><B> 2. </B>to make insane. <BR> <I>Ex. The mother of the kidnaped baby was temporarily deranged by grief.</I> </DL>
<B>derangement, </B>noun.<DL COMPACT><DD><B> 1. </B>a disturbance of order or arrangement. <BR> <I>Ex. Any derangement of the furniture upset her. Where mass opinion dominates the government, there is a morbid derangement of the true functions of power (Atlantic).</I> (SYN) disarrangement, disorder, disorganization. <DD><B> 2. </B><B>=insanity.</B> <DD><B> 3. </B>(Mathematics.) inversion. </DL>
<A NAME="derate">
<B>derate, </B>transitive verb, <B>-rated,</B> <B>-rating.</B><DL COMPACT><DD><B> 1. </B>(Especially British.) to reduce the assessed valuation of (industrial property or the like) as a benefit to business. <BR> <I>Ex. The derating of industry was introduced to assist manufacturers in certain heavy industries during the prewar depression (Sunday Times).</I> <DD><B> 2. </B>to operate (an engine) at reduced power. </DL>
<A NAME="deration">
<B>deration, </B>transitive verb.<DL COMPACT><DD> to free from rationing; remove from rationing. <BR> <I>Ex. to deration meat.</I> </DL>
<A NAME="deratization">
<B>deratization, </B>noun.<DL COMPACT><DD> the getting rid of rats. <BR> <I>Ex. deratization of ships.</I> </DL>
<B>Derby, </B>noun, pl. <B>-bies.</B><DL COMPACT><DD><B> 1. </B>a famous horse race in England founded by the Earl of Derby in 1780 and run every year at Epsom Downs, near London. <DD><B> 2. </B>a horse race of similar importance. <BR> <I>Ex. the Kentucky Derby.</I> <DD><B> 3. </B>a variety of porcelain made at Derby. </DL>
<A NAME="derby">
<B>derby, </B>noun, pl. <B>-bies.</B><DL COMPACT><DD><B> 1. </B>an important race or competition. <BR> <I>Ex. a soapbox derby.</I> <DD><B> 2. </B>a stiff hat with a rounded crown and narrow brim; a bowler. </DL>
<A NAME="derbycheese">
<B>Derby cheese,</B><DL COMPACT><DD> a hard, pressed cheese made from partly skimmed milk, produced chiefly in the Derbyshire district of England. </DL>
<B>derecognition, </B>noun.<DL COMPACT><DD> withdrawal of recognition, as from a country or government. <BR> <I>Ex. Because of Britain's derecognition of the Chinese Republic of Taiwan, there were difficulties over the granting of visas to the Taiwan delegation (Manchester Guardian Weekly).</I> </DL>
<A NAME="derecognize">
<B>derecognize, </B>transitive verb, <B>-nized,</B> <B>-nizing.</B><DL COMPACT><DD> to withdraw recognition or formal acknowledgment of. <BR> <I>Ex. to derecognize a country or government. One ... course within London University has been "derecognized" (New Scientist).</I> </DL>
<A NAME="deregister">
<B>deregister, </B>transitive verb.<DL COMPACT><DD> (British.) to remove from a register; take away the registration of. </DL>
<A NAME="deregle">
<B>de regle,</B><DL COMPACT><DD> (French.) according to rule; in order. <BR> <I>Ex. Since this was a championship bout, hostilities were de regle as soon as the fallen man got to his feet (New Yorker).</I> </DL>
<A NAME="deregulate">
<B>deregulate, </B>transitive verb, <B>-lated,</B> <B>-lating.</B><DL COMPACT><DD><B> 1. </B>to remove regulations or restrictions from. <BR> <I>Ex. ... a plan to liberalize all broadcast regulation and virtually deregulate radio (June B. Csida).</I> <DD><B> 2. </B>to remove price or rate controls from. <BR> <I>Ex. A parallel Administration bill to deregulate natural gas has been shelved (London Sunday Times.)</I> noun <B>deregulation.</B> noun <B>deregulator.</B> </DL>
<A NAME="derelict">
<B>derelict, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>1. </B>that has been abandoned; forsaken; deserted. <BR> <I>Ex. a derelict ship.</I> <DD><B> 2. </B>failing in one's duty; negligent. <BR> <I>Ex. The guard was found derelict in letting the prisoner escape.</I> (SYN) delinquent, unfaithful. <DD><I>noun </I> <B>1. </B>a ship abandoned and afloat at sea. <DD><B> 2. </B>a poor, homeless person who is unwilling or unable to care for himself. <BR> <I>Ex. The ragged old derelict begged for money to buy a meal.</I> <DD><B> 3. </B>any useless, discarded, or forsaken thing. <DD><B> 4. </B>(Law.) land left dry by the gradual receding of water. </DL>
<A NAME="dereliction">
<B>dereliction, </B>noun.<DL COMPACT><DD><B> 1. </B>a failure in one's duty; negligence. <BR> <I>Ex. Because of the watchman's dereliction, thieves managed to enter the bank.</I> <DD><B> 2. </B>abandonment; a forsaking; desertion. <DD><B> 3. </B>(Law.) <DD><B> a. </B>a leaving of dry land by the gradual receding of water. <BR> <I>Ex. Land gained by the dereliction of water (Henry T. Colebrooke).</I> <DD><B> b. </B>the land left dry. </DL>
<A NAME="derepress">
<B>derepress, </B>transitive verb.<DL COMPACT><DD> (Genetics.) to induce (a gene) to operate by disengaging the repressor. <BR> <I>Ex. The group ... now hopes to find out how genes are repressed and derepressed--turned off and on--so that genes can be made to operate when required (Charles S. Marwick).</I> </DL>
<A NAME="derepressor">
<B>derepressor, </B>noun.<DL COMPACT><DD> (Genetics.) a biochemical mechanism that activates a gene by disengaging the repressing mechanism, or repressor; inducer. </DL>
<A NAME="derequisition">
<B>derequisition, </B>noun, verb.<DL COMPACT><DD> (British.) <DD><I>noun </I> the return of property to civilian control after requisition by military authority. <DD><I>v.t. </I> to return (property) to civilian control. </DL>
<A NAME="dererumnatura">
<B>de rerum natura,</B><DL COMPACT><DD> (Latin.) on the nature of things. </DL>
<A NAME="deresination">
<B>deresination, </B>noun.<DL COMPACT><DD> the act or process of removing resin. </DL>
<A NAME="derestrict">
<B>derestrict, </B>transitive verb.<DL COMPACT><DD> to remove restrictions from. </DL>
<A NAME="derestriction">
<B>derestriction, </B>noun.<DL COMPACT><DD> a derestricting or being derestricted. </DL>
<A NAME="dergue">
<B>Dergue</B> or <B>Dirgue, </B>noun.<DL COMPACT><DD> the ruling military council of Ethiopia, established after the deposition of Emperor Haile Selassie. </DL>
<A NAME="deride">
<B>deride, </B>transitive verb, <B>-rided,</B> <B>-riding.</B><DL COMPACT><DD> to make fun of; laugh at in scorn; ridicule with contempt; mock. <BR> <I>Ex. The boys derided him for his fear of the dark.</I> noun <B>derider.</B> adv. <B>deridingly.</B> </DL>
<A NAME="derigueur">
<B>de rigueur,</B><DL COMPACT><DD> (French.) required by etiquette; according to custom; proper. <BR> <I>Ex. Rome grows more Americanized every day. Blue jeans and cowboy suits are currently de rigueur among teen-agers (New Yorker).</I> </DL>
<A NAME="derisible">
<B>derisible, </B>adjective.<DL COMPACT><DD> subject to derision; worthy of derision. </DL>
<A NAME="derision">
<B>derision, </B>noun.<DL COMPACT><DD><B> 1. </B>scornful laughter; ridicule; contempt. <BR> <I>Ex. Children dread the derision of their playmates.</I> <DD><B> 2. </B>an object of ridicule. <BR> <I>Ex. I was a derision to all my people (Lamentations 3:14).</I> </DL>
<B>derisory, </B>adjective.<DL COMPACT><DD><B> 1. </B>mocking; derisive. <BR> <I>Ex. Derisory laughter greeted his stale jokes.</I> <DD><B> 2. </B>laughable; ridiculous. <BR> <I>Ex. Their pay is derisory by comparison with that of politicians in other countries (Manchester Guardian Weekly).</I> </DL>
<B>derivable, </B>adjective.<DL COMPACT><DD> that can be derived. <BR> <I>Ex. It says that the formula in question is not derivable from the axioms of arithmetic (Scientific American).</I> </DL>
<A NAME="derival">
<B>derival, </B>noun. =derivation.</DL>
<A NAME="derivate">
<B>derivate, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> <B>1. </B>something derived. <DD><B> 2. </B>a derivative, such as a word or a chemical product. <DD><I>adj. </I> (Archaic.) derived. </DL>
<A NAME="derivation">
<B>derivation, </B>noun.<DL COMPACT><DD><B> 1. </B>the act or fact of deriving. <BR> <I>Ex. The derivation of many of our laws from Roman law is unmistakable.</I> <DD><B> 2. </B>the state of being derived. <DD><B> 3. </B>origin; source. <BR> <I>Ex. The celebration of Halloween is of Scottish derivation.</I> <DD><B> 4. </B>the system in a language for making new words from old by using prefixes and suffixes and by other methods. (Example:) <I>Quickness = quick</I> + suffix <I>-ness.</I> <DD><B> 5. </B>a statement of how a word was formed; etymology. <DD><B> 6. </B>(Mathematics.) the operation of deducing from one function another function considered or treated as its derivative, such as the operation of finding a differential coefficient in differential calculus. <DD><B> 7. </B><B>=evolution.</B> </DL>
