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_rhodon_, rose, _krinon_, lily.]

RHODODENDRON, r[=o]-d[=o]-den'dron, _n._ a genus of trees and shrubs of the natural order _Ericaceae_, having evergreen leaves and large, beautiful flowers like roses. [Gr. _rhodon_, rose, _dendron_, tree.]

RHODOMELA, r[=o]-dom'e-la, _n._ a genus of marine algae. [Gr. _rhodon_, rose, _melas_, black.]


RHODONITE, r[=o]'d[=o]-n[=i]t, _n._ a native manganese silicate. [Gr.

_rhodon_, a rose.]

RHODOPE, r[=o]'d[=o]-p[=e], _n._ a genus of the family _Rhodopidae_, marine invertebrates of dubious relationships. [_Rhodop[=e]_, a Thracian nymph.]

RHODOPHANE, r[=o]'d[=o]-f[=a]n, _n._ a red pigment found in the retinal cones of the eyes of certain fishes, reptiles, and birds. [Gr. _rhodon_, rose, _phan[=e]s_, appearing.]

RHODOPHYL, r[=o]'d[=o]-fil, _n._ the compound pigment found in the red algae.--_adj._ RHODOPHYL'LOUS. [Gr. _rhodon_, rose, _phyllon_, leaf.]

RHODOPSIN, r[=o]-dop'sin, _n._ a purple pigment found in the retina. [Gr.

_rhodon_, rose, _opsis_, view.]

RHODORA, r[=o]-d[=o]'ra, _n._ a handsome shrub with terminal clusters of pale purple flowers preceding the deciduous leaves: a genus of _Ericaceae_, now included in Rhododendron. [Gr. _rhodon_, a rose.]

RHODOSTAUROTIC, r[=o]-d[=o]-staw-rot'ik, _adj._ (_obs._) rosicrucian. [Gr.

_rhodon_, rose, _stauros_, a cross.]

RHODOSTETHIA, r[=o]-d[=o]-st[=e]'thi-a, _n._ a genus of _Laridae_, with rose-tinted breast and wedge-shaped tail. [Gr. _rhodon_, rose, _st[=e]thos_, the breast.]

RHODOTHAMNUS, r[=o]-d[=o]-tham'nus, _n._ a genus of small shrubs, the ground Cistus. [Gr. _rhodon_, rose, _thamnos_, bush.]

RHODYMENIA, r[=o]-di-m[=e]'ni-a, _n._ a genus of marine algae. [Gr.

_rhodon_, rose, _hym[=e]n_, membrane.]

RHOEADIC, r[=e]-ad'ik, _adj._ pertaining, to or derived from, the red poppy, _Papaver Rhoeas_.--_n._ RHOE'ADINE, a non-poisonous alkaloid found in the same. [Gr. _rhoias_, _rhoiados_, a poppy.]

RHOMB, romb, _n._ a quadrilateral figure having its sides equal but its angles not right angles: (_crystal._) a rhombohedron: (_Milt._) a material circle--also RHOM'BUS.--_adj._ RHOM'BIC.--_ns._ RHOMBICOSIDODECAH[=E]'DRON, a solid having sixty-two faces; RHOMBICUBOCTAH[=E]'DRON, a solid having twenty-six faces.--_adjs._ RHOM'BIFORM, RHOM'BOID, shaped like a rhomb.--FRESNEL'S RHOMB, a rhomb of crown 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 two total reflections. [L.

_rhombus_--Gr. _rhombos_--_rhembein_, to turn round and round.]

RHOMBOCOELIA, rom-b[=o]-s[=e]'li-a, _n._ a dilatation of the spinal cord in the sacral region.--_adj._ RHOMBOCOE'LIAN. [Gr. _rhombos_, rhomb, _koilia_, a cavity.]

RHOMBOGEN, rom'b[=o]-jen, _n._ the infusoriform embryo of a nematoid worm.--_adjs._ RHOMBOGEN'IC, RHOMBOG'ENOUS. [Gr. _rhombos_, rhomb, _gen[=e]s_, producing.]

RHOMBOHEDRON, rom-b[=o]-h[=e]'dron, _n._ a solid bounded by six rhombic planes.--_adj._ RHOMBOH[=E]'DRAL.--_adv._ RHOMBOH[=E]'DRALLY. [Gr.

_rhombos_, rhomb, _hedra_, a base.]

RHOMBOID, rom'boid, _n._ a figure of the form of a rhomb: a quadrilateral figure having only its opposite sides and angles equal.--_adj._ RHOMBOID'AL, having the shape of a rhomboid. [Gr. _rhombos_, rhomb, _eidos_, form.]

RHOMBOIDEUM, rom-boi'd[=e]-um, _n._ (_anat._) the ligament which unites the sternal end of the clavicle with the cartage of the first rib.


RHONCHUS, rong'kus, _n._ a rale, esp. when bronchial.--_adjs._ RHONCH'AL, RHONCH'IAL. [L.,--Gr. _rhengchos_, a snoring--_rhengkein_, to snore.]

RHOPALIC, r[=o]-pal'ik, _n._ a hexameter in which each succeeding word contains one syllable more than what precedes it. [Gr. _rhopalikos_, club-like, _rhopalon_, a club.]

RHOPALOCERA, r[=o]-pa-los'e-ra, an order of _Lepidoptera_, with clubbed antennae.--_adjs._ RHOPALOC'ERAL, RHOPALOC'EROUS. [Gr. _rhopalon_, a club, _keras_, a horn.]

RHOPALODINIDae, r[=o]-pa-l[=o]-din'i-d[=e], the sea-gourds.

RHOTACISM, r[=o]'ta-sizm, _n._ erroneous pronunciation of the letter _r_: burring: the tendency of _s_ to change into _r_.--_v.i._ RH[=O]'TACISE.

RHUBARB, r[=oo]'barb, _n._ a plant, the tender acidulous leaf-stalks of which are much used in cooking, and the root in medicine: the root of any medicinal rhubarb, with cathartic properties.--_adj._ RHU'BARBY.--MONK'S RHUBARB, the patience dock. [O. Fr. _rheubarbe_--Low L. _rheubarbarum_--Gr.

_rh[=e]on barbaron_--_rh[=e]on_, adj. of _rha_, the rha-plant, from the _Rha_, the Volga.]

RHUMB, rumb, or rum, _n._ any vertical circle, hence any point of the compass.--_ns._ RHUMB'-LINE, a line which cuts all the meridians at the same angle; RHUMB'-SAIL'ING, the course of a vessel keeping straight on a rhumb-line. [Fr. _rumb_, a by-form of _rhombe_, through L., from Gr.

_rhombos_, rhomb.]

RHUS, rus, _n._ a genus of shrubs and trees, the cashew-nut family.

[L.,--Gr. _rhous_, sumac.]

RHUSMA, rus'ma, _n._ a mixture of quicklime and orpiment, used as a depilatory.--Also RUS'MA.

RHYACOLITE, r[=i]-ak'[=o]-l[=i]t, _n._ a glassy feldspar found at Mt. Somma in Italy. [Gr. _rhyax_, _rhyakos_, a stream, _lithos_, stone.]

RHYACOPHILIDae, r[=i]-a-k[=o]-fil'i-d[=e], _n._ a family of neuropterous insects.--_n._ RHYACOPH'ILUS, a genus of _Scolopacidae_--the green or solitary sandpiper. [Gr. _rhyax_, a stream, _philein_, to love.]

RHYME, RIME, r[=i]m, _n._ the recurrence of similar sounds at certain intervals: (_orig._) words arranged in numbers or verse: poetry: metre: a short poem.--_v.i._ to correspond in sound: to harmonise: to chime: to make rhymes or verses.--_v.t._ to put into rhyme.--_adj._ RHYME'LESS, without rhyme or reason: without sound or sense: neither pleasant to the mind nor to the ear.--_ns._ RHYME'-LETT'ER, the repeated letters in alliteration (q.v.); RHY'MER, RHY'MIST, R[=I]'MIST, an inferior poet: a minstrel; RHYME'-ROY'AL (so called from its use by King James I. of Scotland in the _King's Quair_), a seven-line stanza borrowed by Chaucer from the French--its formula, _a b a b b c c_; RHYME'STER, a poetaster: a would-be poet.--_adjs._ RHY'MIC, R[=I]'MIC.--FEMININE RHYME (see FEMININE); MALE, or MASCULINE, RHYME, a rhyme in which the accent and rhyme fall on the final syllable only.--NEITHER RHYME NOR REASON, without either sound or sense.--THE RHYMER, Thomas the Rhymer, the earliest poet of Scotland (_flor._ 1286). [Properly _rime_ (the _hy_ being due to the influence of _Rhythm_)--A.S. _rim_, number, cog. with Old High Ger. _r[=i]m_ (Ger.


RHYNCHaeNUS, ring-k[=e]'nus, _n._ a genus of coleopterous insects, of the family of snout-beetles. [Gr. _rhyngchaina_, having a large snout.]

RHYNCHEA, ring-k[=e]'a, _n._ the painted snipe.--_adj._ RHYNCHae'AN. [Gr.

_rhyngchos_, snout.]

RHYNCHETIDae, ring-ket'i-d[=e], a family of suctorial infusorians--its typical genus, RHYNCH[=E]'TA. [Gr. _rhyngchos_, snout, _chait[=e]_, a mane.]

RHYNCHITES, ring-k[=i]'t[=e]z, a genus of weevils. [Gr.

_rhyngchos_, a snout.]

RHYNCHOCOELA, ring-k[=o]-s[=e]'la, a group of proctuchous turbellarians, the nemerteans.--_adj._ RHYNCHOCOE'LAN. [Gr. _rhyngchos_, snout, _koilos_, hollow.]

RHYNCHOCYONIDae, ring-k[=o]-s[=i]-on'i-d[=e], a family of small insectivorous mammals, native to eastern Africa.--_n._ RHYNCHOC'YON. [Gr.

_rhyngchos_, snout, _ky[=o]n_, a dog.]

RHYNCHODONT, ring'k[=o]-dont, _adj._ having the beak toothed, as the falcon. [Gr. _rhyngchos_, snout, _odous_, _odontos_, tooth.]

RYNCHOFLAGELLATE, ring-k[=o]-flaj'e-l[=a]t, _adj._ having a flagellum like a snout.

RHYNCHOLITE, ring'k[=o]-l[=i]t, _n._ the fossil beak of a tetrabranchiate cephalopod. [Gr. _rhyngchos_, snout, _lithos_, stone.]

RHYNCHONELLA, ring-k[=o]-nel'a, _n._ a typical genus of _Rhynchonellidae_, a family of arthropomatous brachiopods. [Gr _rhyngchos_, a snout.]

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