<B>Q-switched, </B>adjective.<DL COMPACT><DD> capable of emitting an extremely short, high-energy pulse by means of a Q-switch. </DL>
<A NAME="qswitching">
<B>Q-switching, </B>noun.<DL COMPACT><DD> the use of a Q-switch to obtain extremely short, high-energy laser pulses. </DL>
<A NAME="qt">
<B>qt.,</B><DL COMPACT><DD><B> 1. </B>quantity. <DD><B> 2. </B>quart or quarts. </DL>
<A NAME="qt">
<B>q.t.,</B> noun.<DL COMPACT><DD> (Slang.) quiet. <BR><I>expr. <B>on the q.t.,</B> </I>very quietly; secretly. <BR> <I>Ex. to do something on the q.t.</I> </DL>
<A NAME="qto">
<B>qto.,</B><DL COMPACT><DD> quarto. </DL>
<A NAME="qts">
<B>qts.,</B><DL COMPACT><DD> quarts. </DL>
<A NAME="qu">
<B>qu.,</B><DL COMPACT><DD> an abbreviation for the following: <DD><B> 1. </B>quart. <DD><B> 2a. </B>quarter. <DD><B> b. </B>quarterly. <DD><B> 3. </B>queen. <DD><B> 4. </B>query. <DD><B> 5. </B>question. </DL>
<A NAME="qua">
<B>qua, </B>adverb.<DL COMPACT><DD> as being; as; in the character or capacity of. <BR> <I>Ex. Qua father, he pitied the boy; qua judge, he condemned him. I find much to admire, qua sound, in these two discs (Irving Kolodin).</I> </DL>
<A NAME="quaalude">
<B>Quaalude, </B>noun.<DL COMPACT><DD> (Trademark.) a nonbarbiturate sedative, widely used as a narcotic and considered addictive. <BR> <I>Ex. Most popular among the downs are ... newer soporifics such as Quaaludes (New York Times).</I> </DL>
<A NAME="quabird">
<B>quabird, </B>noun. <B>=black-crowned night heron.</B></DL>
<A NAME="quack">
<B>quack</B> (1), noun, verb.<DL COMPACT><DD><I>noun </I> <B>1. </B>the sound a duck makes. <BR> <I>Ex. the quack of ducks flying overhead.</I> <DD><B> 2. </B>a sound resembling or imitating this. <DD><I>v.i. </I> to make such a sound. <BR> <I>Ex. the sound of ducks quacking as they flew overhead.</I> </DL>
<A NAME="quack">
<B>quack</B> (2), noun, adjective, verb.<DL COMPACT><DD><I>noun </I> <B>1. </B>a person who dishonestly pretends to be a doctor. <BR> <I>Ex. Running after quacks and mountebanks ... for medicines and remedies (Daniel Defoe).</I> <DD><B> 2. </B>an ignorant pretender to knowledge or skill of any sort. <BR> <I>Ex. Don't pay a quack to tell your fortune. In painting ... Fortunato ... was a quack (Edgar Allan Poe).</I> (SYN) charlatan. <DD><I>adj. </I> <B>1. </B>used by quacks. <BR> <I>Ex. quack medicine. The doctors of medicine ... offered me quack cures for imaginary diseases (George Bernard Shaw).</I> <DD><B> 2. </B>not genuine. <BR> <I>Ex. a quack doctor.</I> <DD><I>v.i. </I> <B>1. </B>to be a quack. <DD><B> 2. </B>to advertise or urge as a quack does. <DD><I>v.t. </I> to treat by quack methods or medicines. </DL>
<A NAME="quack">
<B>quack</B> (3), noun. <B>=quack grass.</B></DL>
<A NAME="quackery">
<B>quackery, </B>noun, pl. <B>-eries.</B><DL COMPACT><DD> the practices or methods of a quack. <BR> <I>Ex. He warned against reaching into the medicine chest of economic quackery every time the slightest quiver runs through production and employment (New York Times).</I> (SYN) charlatanry. </DL>
<A NAME="quackgrass">
<B>quack grass,</B><DL COMPACT><DD> a perennial, coarse, weedy grass which grows wild on sandy or gravelly soil; couch grass. </DL>
<A NAME="quackish">
<B>quackish, </B>adjective.<DL COMPACT><DD> like a quack or charlatan; dealing in quackery. <BR> <I>Ex. Last week [his] purported cure for the ravages of age was exposed as merely the latest in an armlong list of quackish remedies (Time).</I> </DL>
<A NAME="quacksalver">
<B>quacksalver, </B>noun.<DL COMPACT><DD><B> 1. </B>a quack doctor. <DD><B> 2. </B>a quack; charlatan. <BR> <I>Ex. Brother Zeal-of-the-land is no vulgar impostor, no mere religious quacksalver (Algernon Charles Swinburne).</I> </DL>
<A NAME="quacky">
<B>quacky</B> (1), adjective.<DL COMPACT><DD> having a flat, metallic quality, resembling the quack of a duck. <BR> <I>Ex. Our women's voices are, on the whole, ungentle ... they are pitched unpleasantly high and hardened by throat contractions into an habitual "quacky" or metallic quality (F. Osgood).</I> </DL>
<A NAME="quacky">
<B>quacky</B> (2), adjective.<DL COMPACT><DD> suited to a quack; quackish; using the methods of quackery. </DL>
<A NAME="quad">
<B>quad</B> (1), noun.<DL COMPACT><DD> (Informal.) the quadrangle of a college. </DL>
<A NAME="quad">
<B>quad</B> (2), noun.<DL COMPACT><DD> (Informal.) a quadruplet. </DL>
<A NAME="quad">
<B>quad</B> (3), noun, verb, <B>quadded,</B> <B>quadding.</B><DL COMPACT><DD> (Printing.) <DD><I>noun </I> a quadrat. <DD><I>v.t. </I> to fill (a line) with quads in typesetting. </DL>
<A NAME="quad">
<B>quad</B> (4), noun.<DL COMPACT><DD> (U.S.) a unit of energy equal to one quadrillion British thermal units. <BR> <I>Ex. Without any new initiatives the need for imported oil will rise steadily from about 12 quads at present to more than 60 in the year 2000 (Scientific American).</I> </DL>
<B>quadr-,</B><DL COMPACT><DD> (combining form.) the form of <B>quadri-</B> before vowels, as in <I>quadrant.</I> </DL>
<A NAME="quadra">
<B>quadra, </B>noun, pl. <B>-rae.</B><DL COMPACT><DD><B> 1. </B>a square frame or border for enclosing a bas-relief. <DD><B> 2. </B>any frame or border. </DL>
<A NAME="quadrable">
<B>quadrable, </B>adjective.<DL COMPACT><DD> that can be squared. </DL>
<A NAME="quadradisc">
<B>quadradisc, </B>noun.<DL COMPACT><DD> a quadraphonic record. </DL>
<A NAME="quadragenarian">
<B>quadragenarian, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>1. </B>forty years old. <DD><B> 2. </B>between forty and fifty. <DD><I>noun </I> <B>1. </B>a person who is forty years old. <DD><B> 2. </B>a person between forty and fifty years old. </DL>
<A NAME="quadragesima">
<B>Quadragesima, </B>noun.<DL COMPACT><DD><B> 1. </B>the first Sunday in Lent. <DD><B> 2. </B>the forty days of Lent. </DL>
<A NAME="quadragesimal">
<B>Quadragesimal, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or during Lent; suitable for Lent; Lenten. <DD><B> 2. </B>Also, <B>quadragesimal.</B> lasting forty days, as the fast of Lent. </DL>
<A NAME="quadragesimasunday">
<B>Quadragesima Sunday,</B><DL COMPACT><DD> the first Sunday in Lent. </DL>
<A NAME="quadrangle">
<B>quadrangle, </B>noun.<DL COMPACT><DD><B> 1. </B>a four-sided space or court wholly or nearly surrounded by buildings. <BR> <I>Ex. the quadrangle of a palace, a college quadrangle.</I> <DD><B> 2. </B>the buildings around a quadrangle. <BR> <I>Ex. There was a square court behind, round which the house, huts, and store formed a quadrangle (Henry Kingsley).</I> <DD><B> 3. </B>a plane figure with four angles and four sides; quadrilateral. <DD><B> 4. </B>the rectangular area represented by one of the United States Geological Survey topographic maps. The two common sizes are tracts about 13 miles wide by 17 miles north to south and 6 1/2 wide by 8 1/2 miles. </DL>
<B>quadrangular, </B>adjective.<DL COMPACT><DD> like a quadrangle; having four corners or angles. <BR> <I>Ex. a spacious, quadrangular house.</I> </DL>
<A NAME="quadrangularly">
<B>quadrangularly, </B>adverb.<DL COMPACT><DD> in the form of a quadrangle. </DL>
<A NAME="quadrant">
<B>quadrant, </B>noun.<DL COMPACT><DD><B> 1a. </B>a quarter of the circumference of a circle; arc of 90 degrees. <DD><B> b. </B>the area contained by such an arc and two radii drawn perpendicular to each other. <DD><B> 2. </B>a thing or part shaped like a quarter circle. <DD><B> 3. </B>an instrument with a scale of 90 degrees, used in astronomy, surveying, and navigation for measuring altitudes. <DD><B> 4. </B>(Geometry.) one of the four parts into which a plane is divided by two straight lines crossing at right angles. The upper right-hand section is the first quadrant, and, in a counterclockwise direction, the others are the second, third, and fourth quadrants respectively. <DD><B> 5. </B>(Embryology.) one of the four blastomeres in the four-cell stage of the ovum. </DL>
<A NAME="quadrantal">
<B>quadrantal, </B>adjective.<DL COMPACT><DD> of or having to do with a quadrant; included in the fourth part of the surface of a circle. </DL>
<A NAME="quadrantaldeviation">
<B>quadrantal deviation,</B><DL COMPACT><DD> a compass error. </DL>
<A NAME="quadrantid">
<B>Quadrantid, </B>noun.<DL COMPACT><DD> one of a shower of meteors occurring early in January. <BR> <I>Ex. Shower meteors come from well-defined streams, of which the Perseids, the Leonids, and the Quadrantids are among the most celebrated (New Scientist).</I> </DL>
<A NAME="quadrantofsafety">
<B>quadrant of safety,</B><DL COMPACT><DD> the region toward which it is best for a person to run when he sees a tornado approaching. </DL>
<A NAME="quadraphonic">
<B>quadraphonic, </B>adjective.<DL COMPACT><DD> of or having to do with high-fidelity sound transmission or reproduction over four different channels; four-channel. Also, <B>quadriphonic,</B> <B>quadrophonic.</B> adv. <B>quadraphonically.</B> </DL>
<B>quadrat, </B>noun.<DL COMPACT><DD><B> 1. </B>(Printing.) a piece of metal used for wide spaces in setting type; quad. <DD><B> 2. </B>(in experimental agriculture) a square area of convenient size laid off for the purpose of accurate planting. <DD><B> 3. </B>(in phytogeography) a similar square laid off for close study of the relative abundance of species or of other questions. </DL>