<B>Rh factor,</B><DL COMPACT><DD> an antigen found in the red blood cells of most human beings and the higher mammals. Blood containing this substance is Rh positive and does not combine favorably with blood which is Rh negative and lacks this substance. <BR> <I>Ex. The presence or absence of the Rh factor is governed by a dominant gene, which means that when Rh-positive and Rh-negative genes are paired, the resulting children are always Rh-positive (J. Randal).</I> <DL COMPACT><DD> Also, <B>Rhesus factor.</B> </DL>
</DL>
<A NAME="rhg">
<B>R.H.G.,</B><DL COMPACT><DD> Royal Horse Guards. </DL>
<A NAME="rhi">
<B>RHI</B> (no periods),<DL COMPACT><DD> range-height indicator (a radar-scope that shows the range and height of an aircraft). </DL>
<A NAME="rhigolene">
<B>rhigolene, </B>noun.<DL COMPACT><DD> an extremely volatile liquid obtained from petroleum. It is used to produce local anesthesia by freezing. </DL>
<A NAME="rhinal">
<B>rhinal, </B>adjective.<DL COMPACT><DD> of or having to do with the nose; nasal. adv. <B>rhinally.</B> </DL>
<A NAME="rhinarium">
<B>rhinarium, </B>noun, pl. <B>-naria.</B><DL COMPACT><DD><B> 1. </B>the front part of the clypeus, as of neuropteran insects and certain beetles. <DD><B> 2. </B>the area of bare skin around the nostrils of ruminants; muffle. </DL>
<A NAME="rhinegold">
<B>Rhinegold, </B>noun. <B>=Rheingold.</B></DL>
<A NAME="rhinelander">
<B>Rhinelander, </B>noun.<DL COMPACT><DD> a native or inhabitant of the Rhineland region of western Germany. </DL>
<A NAME="rhinemaiden">
<B>Rhinemaiden, </B>noun.<DL COMPACT><DD> any one of the maidens, in Wagner's version of the Nibelung legend, who guard the gold treasure of the Rhine. </DL>
<A NAME="rhinencephalic">
<B>rhinencephalic, </B>adjective.<DL COMPACT><DD> having to do with the rhinencephalon. </DL>
<A NAME="rhinencephalon">
<B>rhinencephalon, </B>noun, pl. <B>-la.</B><DL COMPACT><DD> the part of the brain most closely connected with the olfactory nerves. <BR> <I>Ex. All the brain damage occurred in a region of the cerebrum known as the rhinencephalon (Science News Letter).</I> </DL>
<A NAME="rhinestone">
<B>rhinestone, </B>noun.<DL COMPACT><DD> an imitation diamond, made of glass or paste. </DL>
<A NAME="rhinewine">
<B>Rhine wine,</B><DL COMPACT><DD><B> 1. </B>wine produced in the valley of the Rhine. Most Rhine wines are light, dry, white wines. <DD><B> 2. </B>a similar wine made elsewhere. </DL>
<A NAME="rhinitis">
<B>rhinitis, </B>noun.<DL COMPACT><DD> inflammation of the mucous membrane of the nose. </DL>
<A NAME="rhino">
<B>rhino</B> (1), noun, pl. <B>-nos</B> or <B>-no.</B><DL COMPACT><DD> (Informal.) a rhinoceros. <BR> <I>Ex. We saw two rhino come down to the river to drink (J. H. Patterson).</I> </DL>
<B>rhino-,</B><DL COMPACT><DD> (combining form.) nose; of the nose, as in <I>rhinology, rhinoscope.</I> </DL>
<A NAME="rhinoceros">
<B>rhinoceros, </B>noun, pl. <B>-oses</B> or (collectively) <B>-os.</B><DL COMPACT><DD> a large animal with thick skin and one or two upright horns on the snout. Rhinoceroses are mammals of Africa and Asia and eat grass and other plants. There are five living species in the rhinoceros family. </DL>
<A NAME="rhinocerosbeetle">
<B>rhinoceros beetle,</B><DL COMPACT><DD> any one of several large scarabaeid beetles of tropical regions. The male has a large horn on the head. </DL>
<A NAME="rhinocerosbird">
<B>rhinoceros bird,</B><DL COMPACT><DD> a small bird that perches on the back of the rhinoceros and feeds on the parasitic insects found there; oxpecker. </DL>
<A NAME="rhinoceroshornbill">
<B>rhinoceros hornbill,</B><DL COMPACT><DD> a hornbill of Malaysia having a red and yellow growth that rises from its forehead like a horn. </DL>
<A NAME="rhinocerosiguana">
<B>rhinoceros iguana,</B><DL COMPACT><DD> a rare iguana lizard of the West Indies with three blunt horns on its snout. </DL>
<A NAME="rhinocerosviper">
<B>rhinoceros viper,</B><DL COMPACT><DD> a brilliantly colored viper of the rain forests of central Africa, having a pair of large, pointed growths at the tip of its snout. </DL>
<A NAME="rhinogenous">
<B>rhinogenous, </B>adjective.<DL COMPACT><DD> of nasal origin. </DL>
<A NAME="rhinolaryngology">
<B>rhinolaryngology, </B>noun.<DL COMPACT><DD> the branch of medicine dealing with diseases of the nose and larynx. </DL>
<A NAME="rhinolith">
<B>rhinolith, </B>noun.<DL COMPACT><DD> a calculus formed in the nasal cavities. </DL>
<A NAME="rhinological">
<B>rhinological, </B>adjective.<DL COMPACT><DD> having to do with rhinology. </DL>
<A NAME="rhinologist">
<B>rhinologist, </B>noun.<DL COMPACT><DD> a specialist in diseases of the nose. </DL>
<A NAME="rhinology">
<B>rhinology, </B>noun.<DL COMPACT><DD> the branch of medicine dealing with the nose and its diseases. </DL>
<A NAME="rhinopharyngeal">
<B>rhinopharyngeal, </B>adjective.<DL COMPACT><DD> of or having to do with the nose and the pharynx. </DL>
<A NAME="rhinopharyngitis">
<B>rhinopharyngitis, </B>noun.<DL COMPACT><DD> inflammation of the mucous membrane of the nose and the pharynx. </DL>
<B>rhinoplastic, </B>adjective.<DL COMPACT><DD> of or having to do with rhinoplasty. </DL>
<A NAME="rhinoplasty">
<B>rhinoplasty, </B>noun.<DL COMPACT><DD> plastic surgery of the nose. </DL>
<A NAME="rhinorrhea">
<B>rhinorrhea, </B>noun.<DL COMPACT><DD> excessive secretion of mucus from the nose. <BR> <I>Ex. If the patient is allergic, the onset is frequently sudden, with profuse watery rhinorrhea, sneezing and nasal blockage (Francis Loeffler Lederer).</I> </DL>
<A NAME="rhinoscope">
<B>rhinoscope, </B>noun.<DL COMPACT><DD> an instrument for examining the nasal passages. </DL>
<A NAME="rhinoscopy">
<B>rhinoscopy, </B>noun.<DL COMPACT><DD> use of the rhinoscope. </DL>
<A NAME="rhinotracheitis">
<B>rhinotracheitis, </B>noun.<DL COMPACT><DD> a viral disease of cattle, characterized by inflammation of the mucous membrane of the nose and the windpipe. </DL>
<A NAME="rhinovirus">
<B>rhinovirus, </B>noun.<DL COMPACT><DD> any one of a group of viruses associated with the common cold and other respiratory diseases. <BR> <I>Ex. This could pave the way ... for the development of killed and live virus vaccines, especially the rhinoviruses, which are a principal cause of the common cold and for which there is no specific control (Science News Letter).</I> </DL>
<A NAME="rhipidistian">
<B>rhipidistian, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> of or belonging to a group of crossopterygian fishes believed to be the direct ancestors of the first amphibians. <DD><I>noun </I> a rhipidistian fish. </DL>
<A NAME="rhists">
<B>R. Hist. S.,</B><DL COMPACT><DD> Royal Historical Society. </DL>
<A NAME="rhizobic">
<B>rhizobic, </B>adjective.<DL COMPACT><DD> of or having to do with the rhizobia. </DL>
<A NAME="rhizobium">
<B>rhizobium, </B>noun, pl. <B>-bia.</B><DL COMPACT><DD> any one of a group of rod-shaped, nitrogen-fixing bacteria that live symbiotically in nodules on the roots of leguminous plants. </DL>
<B>rhizocephalous, </B>adjective.<DL COMPACT><DD> of or belonging to a group of crustaceans that are parasitic on crabs, living within the host as a mass of modified cells resembling rootlike processes. </DL>
<A NAME="rhizoctonia">
<B>rhizoctonia, </B>noun.<DL COMPACT><DD> a fungus that causes damping-off and various diseases in plants. </DL>
<B>rhizoid, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>=rootlike.</B> <DD><I>noun </I> one of the rootlike filaments by which a moss, fern, liverwort, or fungus is attached to the substratum. adj. <B>rhizoidlike.</B> </DL>
<A NAME="rhizoidal">
<B>rhizoidal, </B>adjective.<DL COMPACT><DD> resembling a rhizoid. </DL>
<A NAME="rhizomatic">
<B>rhizomatic, </B>adjective.<DL COMPACT><DD> having to do with rhizomes; having the appearance of a rhizome. </DL>
<A NAME="rhizomatous">
<B>rhizomatous, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with a rhizome. <DD><B> 2. </B>having rhizomes. <BR> <I>Ex. But if more plants of the rhizomatous type are wanted, a leaf is pulled off and inserted in regular soil (New York Times).</I> </DL>
<A NAME="rhizome">
<B>rhizome, </B>noun.<DL COMPACT><DD> a rootlike stem lying on or underneath the ground, which usually sends out roots below and leafy shoots above; rootstock. The rhizome stores food to be used by the new plant the following year. <BR> <I>Ex. In some underground stems, that is rhizomes, many of these leaves develop very poorly, taking the form of scales (Fred W. Emerson).</I> </DL>
<A NAME="rhizomic">
<B>rhizomic, </B>adjective.<DL COMPACT><DD> belonging to or consisting of rhizomes. </DL>
<A NAME="rhizomorph">
<B>rhizomorph, </B>noun.<DL COMPACT><DD> a rootlike filament of hypha in various fungi. </DL>
<A NAME="rhizomorphous">
<B>rhizomorphous, </B>adjective.<DL COMPACT><DD> (Botany.) rootlike in form. </DL>
<A NAME="rhizophagous">
<B>rhizophagous, </B>adjective.<DL COMPACT><DD> feeding on roots. </DL>
<A NAME="rhizophilous">
<B>rhizophilous, </B>adjective.<DL COMPACT><DD> growing or parasitic upon roots. </DL>
<A NAME="rhizophoraceous">
<B>rhizophoraceous, </B>adjective.<DL COMPACT><DD> belonging to a family of mostly tropical trees and shrubs typified by the mangrove. </DL>
<A NAME="rhizopod">
<B>rhizopod, </B>noun.<DL COMPACT><DD> any one of a class of mostly marine protozoans that have pseudopods for moving about and taking in food; sarcodinian. <BR> <I>Ex. Amebas are rhizopods.</I> </DL>
<A NAME="rhizopodan">
<B>rhizopodan, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> <B>=rhizopod.</B> <DD><I>adj. </I> of or having to do with a rhizopod. </DL>
