<B>hybridism, </B>noun.<DL COMPACT><DD><B> 1. </B>the production of hybrids; crossbreeding. <DD><B> 2. </B>hybrid character, nature, or condition. </DL>
<A NAME="hybridist">
<B>hybridist, </B>noun.<DL COMPACT><DD> a person who produces hybrids by crossing different species; hybridizer. </DL>
<A NAME="hybridity">
<B>hybridity, </B>noun.<DL COMPACT><DD> hybrid character, nature, or condition. </DL>
<A NAME="hybridize">
<B>hybridize, </B>verb, <B>-ized,</B> <B>-izing.</B><DL COMPACT><DD><I>v.t. </I> <B>1. </B>to cause to produce hybrids. <BR> <I>Ex. Botanists hybridize different kinds of plants in order to get new varieties.</I> <DD><B> 2. </B>to form in a hybrid manner. <BR> <I>Ex. to hybridize words.</I> <DD><I>v.i. </I> to produce a hybrid or hybrids; cross; interbreed. noun <B>hybridization.</B> noun <B>hybridizer.</B> </DL>
<A NAME="hybridoma">
<B>hybridoma, </B>noun.<DL COMPACT><DD> a cell formed by the fusion of two different cells. <BR> <I>Ex. Tissue typing ... is the labour to which immunologists foresaw the end when they made the first antibody-secreting hybridoma: a hybrid between an ordinary mouse antibody-secreting cell, which has only a limited lifespan, and an immortal tumour cell from a mouse myeloma (New Scientist).</I> </DL>
<B>hydantoin, </B>noun.<DL COMPACT><DD> a white, crystalline compound, found in molasses, used in making pharmaceuticals and resins. </DL>
<A NAME="hydathode">
<B>hydathode, </B>noun.<DL COMPACT><DD> a specialized layer of cells on the tips and margins of certain leaves, from which water is secreted. </DL>
<A NAME="hydatid">
<B>hydatid, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> <B>1. </B>a cyst containing a clear, watery fluid, produced in man and animals by a tapeworm in the larval state. <DD><B> 2. </B>the larva of a tapeworm in its encysted state. <DD><I>adj. </I> of, belonging to, or like a hydatid. </DL>
<A NAME="hyde">
<B>Hyde, </B>noun. <B>Mr.,</B><DL COMPACT><DD> the evil side of Dr. Jekyll's personality in Robert Louis Stevenson's story, <I>The Strange Case of Dr. Jekyll and Mr. Hyde.</I> </DL>
<A NAME="hydnocarpate">
<B>hydnocarpate, </B>noun.<DL COMPACT><DD> a salt or ester of hydnocarpic acid. </DL>
<A NAME="hydnocarpicacid">
<B>hydnocarpic acid,</B><DL COMPACT><DD> an acid derived from chaulmoogra oil, used in treating leprosy. </DL>
<A NAME="hydr">
<B>hydr-,</B><DL COMPACT><DD> (combining form.) the form of <B>hydro-</B> before vowels, as in <I>hydrant.</I> </DL>
<A NAME="hydra">
<B>Hydra, </B>noun, genitive (def. 2) <B>Hydrae.</B><DL COMPACT><DD><B> 1. </B>(Greek Mythology.) a monstrous serpent having nine snakelike heads. When one head was cut off, two heads grew in its place. Hercules finally killed it. <DD><B> 2. </B>a southern constellation that stretches nearly one third of the way around the southern sky, seen by ancient astronomers as having the rough outline of a serpent and called the Water Snake. </DL>
<A NAME="hydra">
<B>hydra, </B>noun, pl. <B>-dras,</B> <B>-drae.</B><DL COMPACT><DD><B> 1. </B>a kind offreshwater polyp or coelenterate with a tubelike body and stinging tentacles. When the tubelike body is cut into pieces, each piece forms a new individual. <DD><B> 2. </B>(Figurative.) any persistent evil; evil that is hard to overcome. <BR> <I>Ex. Traffic in narcotics is a modern hydra.</I> </DL>
<A NAME="hydracid">
<B>hydracid, </B>noun.<DL COMPACT><DD> an acid that contains no oxygen, such as hydrochloric acid, which is composed of hydrogen and chlorine. </DL>
<A NAME="hydrae">
<B>Hydrae, </B>noun.<DL COMPACT><DD> genitive of <B>Hydra</B> (def. 2). </DL>
<A NAME="hydraheaded">
<B>hydra-headed, </B>adjective.<DL COMPACT><DD><B> 1. </B>having many heads, like the Hydra. <DD><B> 2. </B>self-renewing, like the Hydra. <DD><B> 3. </B>(Figurative.) difficult to destroy. <BR> <I>Ex. the hydra-headed corruption of bureaucracy.</I> </DL>
<A NAME="hydralazine">
<B>hydralazine, </B>noun.<DL COMPACT><DD> a drug sometimes used in the treatment of high blood pressure, though often accompanied by side effects. </DL>
<A NAME="hydramatic">
<B>Hydra-Matic, </B>adjective.<DL COMPACT><DD> (Trademark.) utilizing a fluid coupling to transmit power from the engine to the drive shaft. <BR> <I>Ex. Hydra-Matic transmission.</I> </DL>
<A NAME="hydrangea">
<B>hydrangea, </B>noun.<DL COMPACT><DD><B> 1. </B>any one of a group of shrubs with opposite leaves and large, showy clusters of small, white, pink, or blue flowers. It belongs to the saxifrage family. <DD><B> 2. </B>its flower. </DL>
<A NAME="hydrangeaceous">
<B>hydrangeaceous, </B>adjective.<DL COMPACT><DD> characteristic of the hydrangeas. </DL>
<A NAME="hydrant">
<B>hydrant, </B>noun.<DL COMPACT><DD> a large upright pipe with a valve for drawing water directly from a water main; a hose connection; fire hydrant; fire plug. Hydrants are used to get water to put out fires and to wash the streets. <BR><I>expr. <B>hook the hydrant,</B> </I>to attach a fire hose to a hydrant. <BR> <I>Ex. As the fire truck passed by, a fireman threw off the end of the hose and another man hooked the hydrant.</I> </DL>
<A NAME="hydranth">
<B>hydranth, </B>noun.<DL COMPACT><DD> the flower-shaped structure at the top of the stalk of a hydroid polyp, containing the digestive cavity and a terminal mouth, usually surrounded by tentacles. </DL>
<B>hydrargyrol, </B>noun.<DL COMPACT><DD> an organic salt of mercury, occurring in brownish-red scales, used as an antiseptic. </DL>
<A NAME="hydrargyrum">
<B>hydrargyrum, </B>noun. <B>=mercury.</B><DL COMPACT><DD> (Abbr:) Hg (no period). </DL>
<A NAME="hydrase">
<B>hydrase, </B>noun.<DL COMPACT><DD> an enzyme that catalyzes the addition of water to a substrate without hydrolyzing it. </DL>
<A NAME="hydrastin">
<B>hydrastin, </B>noun. <B>=hydrastine.</B></DL>
<A NAME="hydrastine">
<B>hydrastine, </B>noun.<DL COMPACT><DD> a crystalline alkaloid found in the rootstock of the goldenseal, formerly used in medicine. </DL>
<A NAME="hydrastinine">
<B>hydrastinine, </B>noun.<DL COMPACT><DD> a colorless, crystalline compound formed by the oxidation of hydrastine, used in medicine. </DL>
<A NAME="hydrastis">
<B>hydrastis, </B>noun. <B>=goldenseal.</B></DL>
<A NAME="hydrate">
<B>hydrate, </B>noun, verb, <B>-drated,</B> <B>-drating.</B><DL COMPACT><DD><I>noun </I> any chemical compound made when certain substances unite chemically with water in a definite weight ratio, represented in formulas as containing molecules of water. Washing soda is a hydrate. <DD><I>v.i., v.t. </I> to become or cause to become a hydrate; combine with water to form a hydrate. Washing soda is hydrated sodium carbonate. noun <B>hydration.</B> </DL>
<A NAME="hydrator">
<B>hydrator, </B>noun.<DL COMPACT><DD> a thing that hydrates. </DL>
<B>hydraulic, </B>adjective.<DL COMPACT><DD><B> 1. </B>having to do with water or other liquids at rest or in motion. <DD><B> 2. </B>operated by the pressure of water or other liquids in motion, especially when forced through an opening or openings. <BR> <I>Ex. a hydraulic crane, a hydraulic press.</I> <DD><B> 3. </B>hardening under water. <BR> <I>Ex. hydraulic cement.</I> <DD><B> 4. </B>having to do with hydraulics. <BR> <I>Ex. hydraulic engineering, hydraulic mining.</I> adv. <B>hydraulically.</B> </DL>
<A NAME="hydraulicbrake">
<B>hydraulic brake,</B><DL COMPACT><DD> a brake in which fluid under pressure operates the mechanical parts. </DL>
<B>hydraulic gradient,</B><DL COMPACT><DD> the rate of fall of pressure head along a conduit filled with flowing liquid. </DL>
<A NAME="hydraulicity">
<B>hydraulicity, </B>noun.<DL COMPACT><DD> the quality or property of being hydraulic. <BR> <I>Ex. the hydraulicity of cement.</I> </DL>
<A NAME="hydraulicjump">
<B>hydraulic jump,</B><DL COMPACT><DD> an abrupt, turbulent rise in the level of a flowing liquid caused by an obstruction or a change in the slope of its path. <BR> <I>Ex. At low discharges a hydraulic jump ... is formed upstream of the weir which marks the transition from shallow, fast flow to deeper, slower flow (New Scientist).</I> </DL>
<A NAME="hydraulicking">
<B>hydraulicking, </B>noun.<DL COMPACT><DD> a form of placer mining using a powerful stream of water shooting through a large nozzle to move mineral-bearing gravel or sand directly from a deposit into a riffle. </DL>
<A NAME="hydraulicpress">
<B>hydraulic press,</B><DL COMPACT><DD> a machine in which the pressure exerted by a small piston is communicated through a confined liquid to a large piston, the force being multiplied as many times as the area of the smaller piston must be multiplied to equal that of the larger. </DL>
<A NAME="hydraulicram">
<B>hydraulic ram,</B><DL COMPACT><DD> a device by which the energy of descending water is used to raise a part of the water to a height greater than that of the source. </DL>
<A NAME="hydraulics">
<B>hydraulics, </B>noun.<DL COMPACT><DD> the science dealing with water and other liquids at rest or in motion, their uses in engineering, and the laws of their actions. Hydraulics deals with both hydrodynamics and hydrostatics. </DL>
<B>hydrazine, </B>noun.<DL COMPACT><DD><B> 1. </B>a colorless, fuming, highly corrosive liquid used in organic synthesis and as a fuel for rockets. <DD><B> 2. </B>any one of a group of compounds derived from this liquid by replacement of one or more hydrogen atoms with an organic radical. </DL>
<A NAME="hydrazoate">
<B>hydrazoate, </B>noun.<DL COMPACT><DD> a salt of hydrazoic acid, especially one of silver or mercury. </DL>
