Rhizogen Rhiz"o·gen noun (Botany) One of a proposed class of flowering plants growning on the roots of other plants and destitute of green foliage.
Rhizoid Rhi"zoid noun [ Greek ......... root +
-oid .]
(Botany) A rootlike appendage.
Rhizoma Rhi·zo"ma noun ;
plural Rhizomata . [ New Latin ]
(Botany) SAme as Rhizome .
Rhizomatous Rhi·zo"ma·tous adjective (Botany) Having the nature or habit of a rhizome or rootstock.
Rhizome Rhi·zome" noun [ Greek ......... the mass of roots (of a tree), a stem, race, from ......... to make to root, pass., to take root, from ......... a root: confer French
rhizome .]
(Botany) A rootstock. See Rootstock .
Rhizophaga Rhi·zoph"a·ga noun plural [ New Latin ]
(Zoology) A division of marsupials. The wombat is the type.
Rhizophagous Rhi·zoph"a·gous adjective [ Greek .........; ......... a root + ......... to eat.]
Feeding on roots; root- eating.
Rhizophora Rhi·zoph"o·ra noun [ New Latin See
Rhizophorous .]
(Botany) A genus of trees including the mangrove. See Mangrove .
Rhizophorous Rhi·zoph"o·rous adjective [ Greek ......... a root + ............ to bear.]
(Botany) Bearing roots.
Rhizopod Rhiz"o·pod noun (Zoology) One of the Rhizopoda. » The rhizopods belonging to the Radiolaria and Foraminifera have been of great geological importance, especially in the Cretaceous and Tertiary periods. Chalk is mostly made from the shells of Foraminifera. The nummulites are the principal ingredient of a limestone which is of great extent in Europe and Asia, and is the material of which some of the pyramids of Egypt are made. The shells are abundant in deepsea mud, and are mostly minute, seldom larger than a small grain of sand, except in the case of the nummulities, which are sometimes an inch in diameter.
Rhizopoda Rhi·zop"o·da noun plural [ New Latin , from Greek ......... a root +
-poda .]
(Zoology) An extensive class of Protozoa, including those which have pseudopodia, by means of which they move about and take their food. The principal groups are Lobosa (or Amœbea), Helizoa, Radiolaria, and Foraminifera (or Reticularia). See Protozoa .
Rhizopodous Rhi·zop"o·dous adjective (Zoology) Of or pertaining to the rhizopods.
Rhizostomata Rhi`zo·stom"a·ta noun plural [ New Latin , from Greek ......... a root + ........., ............, a mouth.]
(Zoology) A suborder of Medusæ which includes very large species without marginal tentacles, but having large mouth lobes closely united at the edges. See Illust. in Appendix.
Rhizostome Rhiz"o·stome noun (Zoology) One of the Rhizostomata.
Rhizotaxis Rhi`zo·tax"is noun [ New Latin , from Greek ......... a root + ......... arrangement.]
(Botany) The arrangement of the roots of plants.
Rhob Rhob (rŏb)
noun See 1st Rob .
Rhodammonium Rho`dam·mo"ni·um adjective (Chemistry) Pertaining to, derived from, or containing, rhodium and ammonia; -- said of certain complex compounds.
Rhodanate Rho"da·nate noun (Chemistry) A salt of rhodanic acid; a sulphocyanate. [ Obsoles.]
Rhodanic Rho·dan"ic adjective [ Greek ......... the rose.]
(Chemistry) Pertaining to, or designating, an acid (commonly called sulphocyanic acid ) which frms a red color with ferric salts. [ Obsoles.]
Rhodeoretin Rho`de·o·re"tin noun [ Greek ......... the rose + ......... resin.]
(Chemistry) Same as Convolvuln .
Rhodian Rho"di·an adjective [ Latin
Rhodius : confer French
rhodien .]
Of or pertaining to Rhodes, an island of the Mediterranean. --
noun A native or inhabitant of Rhodes.
Rhodic Rho"dic adjective (Chemistry) Of or pertaining to rhodium; containing rhodium.
Rhodium Rho"di·um noun [ New Latin , from Greek
"ro`don the rose. So called from the rose-red color of certain of its solutions. See
Rhododendron .]
(Chemistry) A rare element of the light platinum group. It is found in platinum ores, and obtained free as a white inert metal which it is very difficult to fuse. Symbol Rh. Atomic weight 104.1. Specific gravity 12.
Rhodizonic Rho`di·zon"ic adjective [ Greek ......... to be rose-red.]
(Chemistry) Pertaining to, or designating, a colorless crystalline substance (called rhodizonic acid , and carboxylic acid ) obtained from potassium carboxide and from certain quinones. It forms brilliant red, yellow, and purple salts.
Rhodochrosite Rho`do·chro"site noun [ Greek
"ro`don the rose + ......... a coloring.]
(Min.) Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite .
Rhodocrinite Rho·doc"ri·nite noun [ Greek
"ro`don rose + ......... lily.]
(Paleon.) A rose encrinite.
Rhododendron Rho`do·den"dron noun [ Latin , from Greek
"rodo`dendron , literally, rose tree;
"ro`don rose +
de`ndron tree. See
Rose .]
(Botany) A genus of shrubs or small trees, often having handsome evergreen leaves, and remarkable for the beauty of their flowers; rosebay.
Rhodomontade Rhod`o·mon·tade" noun See Rodomontade .
Rhodomontader Rhod`o·mon·tad"er noun See Rodomontador .
Rhodonite Rho"don·ite noun [ Greek
"ro`don the rose. ]
(Min.) Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.
Rhodophane Rho"do·phane noun [ Greek
"ro`don the rose + ......... to show.]
(Physiol.) The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane . W. Kûhne.
Rhodopsin Rho·dop"sin noun [ Greek
"ro`don rose +
"w`ps eye.]
(Physiol.) The visual purple. See under Visual .
Rhodosperm Rho"do·sperm noun [ Greek
"ro`don the rose +
spe`rma a seed.]
(Botany) Any seaweed with red spores. » As the name of a subclass,
Rhodosperms , or
Rhodospermeæ , is synonymous with
Florideæ (which see.)
Rhomb Rhomb noun [ Latin
rhombus , Greek ......... rhomb, a spinning top, magic wheel, from ......... to turn or whirl round, perhaps akin to English
wrench : confer French
rhombe . Confer
Rhombus ,
Rhumb .]
1. (Geom.) An equilateral parallelogram, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square . 2. (Geom.) A rhombohedron. Fresnel's rhomb (Opt.) ,
a rhomb or oblique parallelopiped of crown or St. Gobain glass so cut that a ray of light entering one of its faces at right angles shall emerge at right angles at the opposite face, after undergoing within the rhomb, at other faces, two reflections. It is used to produce a ray circularly polarized from a plane-polarized ray, or the reverse. Nichol.
Rhomb spar Rhomb" spar` (Min.) A variety of dolomite.
Rhombic Rhom"bic adjective 1. Shaped like a rhomb. 2. (Crystallog.) Same as Orthorhombic .
Rhomboganoid Rhom`bo·ga"noid noun [
Rhomb +
ganoid .]
(Zoology) A ganoid fish having rhombic enameled scales; one of the Rhomboganoidei.
Rhomboganoidei Rhom`bo·ga·noi"de·i noun plural [ New Latin ]
(Zoology) Same as Ginglymodi .
Rhombogene Rhom"bo·gene noun [
Rhomb + root of Greek ......... to be born.]
(Zoology) A dicyemid which produces infusorialike embryos; -- opposed to nematogene . See Dicyemata . [ Written also
rhombogen .]
Rhombohedral Rhom`bo·he"dral adjective (Geom. & Crystallog.) Related to the rhombohedron; presenting the form of a rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron. Rhombohedral iron ore (Min.) See Hematite . --
Rhombohedral system (Crystallog.) ,
a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc.
Rhombohedric Rhom`bo·hed"ric adjective (Geom. & Crystallog.) Rhombohedral.
Rhombohedron Rhom`bo·he"dron noun [ New Latin , from Greek ......... rhomb + ......... seat, base.]
(Geom. & Crystallog.) A solid contained by six rhomboids; a parallelopiped.
Rhomboid Rhom"boid (rŏm"boid)
noun [ Greek ......... rhomboidal; ......... rhomb +
e'i^dos shape: confer French
rhomboïde .]
(Geom.) An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.
Rhomboid Rhom"boid (rŏm"boid)
adjective Same as Rhomboidal .
Rhomboid-ovate Rhom`boid-o"vate adjective Between rhomboid and ovate, or oval, in shape.
Rhomboidal Rhom·boid"al adjective [ Confer French
rhomboïdal .]
Having, or approaching, the shape of a rhomboid.
Rhomboides Rhom·boid"es noun A rhomboid. [ R.]
Milton.
Rhombus Rhom"bus noun [ Latin ]
Same as Rhomb , 1.
Rhonchal Rhon`chal adjective (Medicine) Rhonchial.
Rhonchial Rhon"chi·al adjective (Medicine) Of or pertaining to a rhonchus; produced by rhonchi. Rhonchial fremitus . [ Latin
fremitus a dull roaring or murmuring.]
(Medicine) A vibration of the chest wall that may be felt by the hand laid upon its surface. It is caused in the production of rhonchi in the bronchial tubes.
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