Encyclo - Webster's Revised Unabridged Dictionary (1913)

Webster's Dictionary, 1913

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Rhizocephala noun plural [ New Latin , from Greek ......... root + ......... head.] (Zoology) A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix.

Rhizodont noun [ Greek ......... root + ........., ........., a tooth.] (Zoology) A reptile whose teeth are rooted in sockets, as the crocodile.

Rhizogan adjective [ Greek ......... root + -gen : confer French rhizogène .] (Botany) Prodicing roots.

Rhizogen noun (Botany) One of a proposed class of flowering plants growning on the roots of other plants and destitute of green foliage.

Rhizoid noun [ Greek ......... root + -oid .] (Botany) A rootlike appendage.

Rhizoma noun ; plural Rhizomata . [ New Latin ] (Botany) SAme as Rhizome .

Rhizomatous adjective (Botany) Having the nature or habit of a rhizome or rootstock.

Rhizome 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 noun plural [ New Latin ] (Zoology) A division of marsupials. The wombat is the type.

Rhizophagous adjective [ Greek .........; ......... a root + ......... to eat.] Feeding on roots; root- eating.

Rhizophora noun [ New Latin See Rhizophorous .] (Botany) A genus of trees including the mangrove. See Mangrove .

Rhizophorous adjective [ Greek ......... a root + ............ to bear.] (Botany) Bearing roots.

Rhizopod 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 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 adjective (Zoology) Of or pertaining to the rhizopods.

Rhizostomata 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 noun (Zoology) One of the Rhizostomata.

Rhizotaxis noun [ New Latin , from Greek ......... a root + ......... arrangement.] (Botany) The arrangement of the roots of plants.

Rhob (rŏb) noun See 1st Rob .

Rhodammonium adjective (Chemistry) Pertaining to, derived from, or containing, rhodium and ammonia; -- said of certain complex compounds.

Rhodanate noun (Chemistry) A salt of rhodanic acid; a sulphocyanate. [ Obsoles.]

Rhodanic 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 noun [ Greek ......... the rose + ......... resin.] (Chemistry) Same as Convolvuln .

Rhodian adjective [ Latin Rhodius : confer French rhodien .] Of or pertaining to Rhodes, an island of the Mediterranean. -- noun A native or inhabitant of Rhodes.

Rhodic adjective (Chemistry) Of or pertaining to rhodium; containing rhodium.

Rhodium 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 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 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 noun [ Greek "ro`don rose + ......... lily.] (Paleon.) A rose encrinite.

Rhododendron 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 noun See Rodomontade .

Rhodomontader noun See Rodomontador .

Rhodonite 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 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 noun [ Greek "ro`don rose + "w`ps eye.] (Physiol.) The visual purple. See under Visual .

Rhodosperm 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 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 (Min.) A variety of dolomite.

Rhombic adjective
1. Shaped like a rhomb.

2. (Crystallog.) Same as Orthorhombic .

Rhomboganoid noun [ Rhomb + ganoid .] (Zoology) A ganoid fish having rhombic enameled scales; one of the Rhomboganoidei.

Rhomboganoidei noun plural [ New Latin ] (Zoology) Same as Ginglymodi .

Rhombogene noun [ Rhomb + root of Greek ......... to be born.] (Zoology) A dicyemid which produces infusorialike embryos; -- opposed to nematogene . See Dicyemata . [ Written also rhombogen .]

Rhombohedral 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 adjective (Geom. & Crystallog.) Rhombohedral.

Rhombohedron noun [ New Latin , from Greek ......... rhomb + ......... seat, base.] (Geom. & Crystallog.) A solid contained by six rhomboids; a parallelopiped.

Rhomboid (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 (rŏm"boid) adjective Same as Rhomboidal .

Rhomboid-ovate adjective Between rhomboid and ovate, or oval, in shape.

Rhomboidal adjective [ Confer French rhomboïdal .] Having, or approaching, the shape of a rhomboid.

Rhomboides noun A rhomboid. [ R.] Milton.