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Rhizostomata
n. pl.
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A suborder of Medusae which includes very large species without marginal tentacles, but having large mouth lobes closely united at the edges. See Illust. in Appendix.
Rhizostome
n.
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One of the Rhizostomata.
Rhizotaxis
n.
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The arrangement of the roots of plants.
Rhob
n.
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See 1st Rob.
Rhodammonium
a.
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Pertaining to, derived from, or containing, rhodium and ammonia; -- said of certain complex compounds.
Rhodanate
n.
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A salt of rhodanic acid; a sulphocyanate.
Rhodanic
a.
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Pertaining to, or designating, an acid (commonly called sulphocyanic acid) which frms a red color with ferric salts.
Rhodeoretin
n.
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Same as Convolvuln.
Rhodian
a.
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Of or pertaining to Rhodes, an island of the Mediterranean.
Rhodian
n.
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A native or inhabitant of Rhodes.
Rhodic
a.
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Of or pertaining to rhodium; containing rhodium.
Rhodium
n.
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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
a.
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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
n.
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Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite.
Rhodocrinite
n.
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A rose encrinite.
Rhododendron
n.
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A genus of shrubs or small trees, often having handsome evergreen leaves, and remarkable for the beauty of their flowers; rosebay.
Rhodomontade
n.
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See Rodomontade.
Rhodomontader
n.
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See Rodomontador.
Rhodonite
n.
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Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.
Rhodophane
n.
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The red pigment contained in the inner segments of the cones of the retina in animals. See Chromophane.
Rhodopsin
n.
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The visual purple. See under Visual.
Rhodosperm
n.
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Any seaweed with red spores.
Rhomb
n.
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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.
Rhomb
n.
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A rhombohedron.
Rhombic
a.
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Shaped like a rhomb.
Rhombic
a.
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Same as Orthorhombic.
Rhomboganoid
n.
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A ganoid fish having rhombic enameled scales; one of the Rhomboganoidei.
Rhomboganoidei
n. pl.
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Same as Ginglymodi.
Rhombogene
n.
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A dicyemid which produces infusorialike embryos; -- opposed to nematogene. See Dicyemata.
Rhombohedral
a.
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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.