||Rhab`do*cœ"la (rb`d*s"l), n. pl. [NL., fr. Gr. "ra`bdos a rod +
||koi^los hollow.] (Zoöl.) A suborder of Turbellaria including those
||that have a simple cylindrical, or saclike, stomach, without an
||intestine.
Rhab`do*cœ"lous (-ls), a. (Zoöl.) Of or pertaining to the Rhabdocœla.
Rhab*doid"al (?), a. See Sagittal.
Rhab"do*lith (?), n. [Gr. "ra`bdos a rod + -lith.] A minute calcareous
rodlike structure found both at the surface and the bottom of the
ocean; -- supposed by some to be a calcareous alga.
Rhab*dol"o*gy (?), n. Same as Rabdology.
Rhab"dom (rb"dm), n. [Gr. "ra`bdwma a bundle of rods, fr. "ra`bdos a
rod.] (Zoöl.) One of numerous minute rodlike structures formed of two
or more cells situated behind the retinulæ in the compound eyes of
insects, etc. See Illust. under Ommatidium.
Rhab"do*man`cy (?), n. Same as Rabdomancy.
Rhab"do*mere (?), n. [Rhabdom + -mere.] (Zoöl.) One of the several
parts composing a rhabdom.
||Rhab*doph"o*ra (?), n. pl. [NL., fr. Gr. "ra`bdos a rod + &?;&?;&?;
||to bear.] (Zoöl.) An extinct division of Hydrozoa which includes the
||graptolities.
||Rhab`do*pleu"ra (?), n. [NL., fr. Gr. "ra`bdos a rod + &?;&?;&?;&?;
||the side.] (Zoöl.) A genus of marine Bryozoa in which the tubular
||cells have a centralchitinous axis and the tentacles are borne on a
||bilobed lophophore. It is the type of the order Pterobranchia, or
||Podostomata
Rhab"do*sphere (?), n. [Gr. "ra`bdos a rod + E. sphere.] A minute
sphere composed of rhabdoliths.
||Rha`chi*al"gi*a (?), n. [NL.] See Rachialgia.
Rha*chid"i*an (?), a. Of or pertaining to the rhachis; as, the
rhachidian teeth of a mollusk.
||Rhach`i*glos"sa (?), n. pl. [NL. See Rhachis, and Glossa.] (Zoöl.) A
||division of marine gastropods having a retractile proboscis and three
||longitudinal rows of teeth on the radula. It includes many of the
||large ornamental shells, as the miters, murices, olives, purpuras,
||volutes, and whelks. See Illust. in Append.
||Rha*chil"la (?), n. [NL., fr. Gr. "ra`chis the spine.] (Bot.) A
||branch of inflorescence; the zigzag axis on which the florets are
||arranged in the spikelets of grasses.
Rha"chi*o*dont (?), a. [Gr. "ra`chis, -ios, the spine + &?;&?;&?;,
&?;&?;&?;, a tooth.] (Zoöl.) Having gular teeth formed by a peculiar
modification of the inferior spines of some of the vertebræ, as certain
South African snakes (Dasypeltis) which swallow birds' eggs and use
these gular teeth to crush them.
||Rha"chis (?), n.; pl. E. Rhachises (#), L. Rhachides (#). [See
||Rachis.] [Written also rechis.] 1. (Anat.) The spine.
2. (Bot.) (a) The continued stem or midrib of a pinnately compound
leaf, as in a rose leaf or a fern. (b) The principal axis in a raceme,
spike, panicle, or corymb.
3. (Zoöl.) (a) The shaft of a feather. The rhachis of the after-shaft,
or plumule, is called the hyporhachis. (b) The central cord in the stem
of a crinoid. (c) The median part of the radula of a mollusk. (d) A
central cord of the ovary of nematodes.
||Rha*chi"tis (?), n. [NL.] See Rachitis.
Rhad`a*man"thine (?), a. Of or pertaining to Rhadamanthus; rigorously
just; as, a Rhadamanthine judgment.
Rhad`a*man"thus (?), n. [L., fr. Gr. &?;&?;&?;.] (Greek Mythol.) One of
the three judges of the infernal regions; figuratively, a strictly just
judge.
Rhæ"ti*an (?), a & n. Rhetain.
Rhæ"tic (?), a. [L. Rhaeticus Rhetian.] (Geol.) Pertaining to, or of
the same horizon as, certain Mesozoic strata of the Rhetian Alps. These
strata are regarded as closing the Triassic period. See the Chart of
Geology.
Rhæ"ti*zite (?), n. [So called from L. Rhaetia, Raetia, the Rhetian
Alps, where it is found.] (Min.) A variety of the mineral cyanite.
||Rham`a*dan" (?), n. See Ramadan.
Rham*na"ceous (?), a. (Bot.) Of or pertaining to a natural order of
shrubs and trees (Rhamnaceæ, or Rhamneæ) of which the buckthorn
(Rhamnus) is the type. It includes also the New Jersey tea, the
supple-jack, and one of the plants called lotus (Zizyphus).
||Rham"nus (?), n. [NL., from Gr. "ra`mnos a kind of prickly shrub; cf.
||L. rhamnos.] (Bot.) A genus of shrubs and small trees; buckthorn. The
||California Rhamnus Purshianus and the European R. catharticus are
||used in medicine. The latter is used for hedges.
||Rham`pho*rhyn"chus (?), n. [NL., fr. Gr. "ra`mfos a beak +
||&?;&?;&?;&?; snout.] (Paleon.) A genus of pterodactyls in which the
||elongated tail supported a leathery expansion at the tip.
||Rham`pho*the"ca (?), n.; pl. Rhamphothecæ (#). [NL., fr. Gr "ra`mnos
||a beak + &?;&?; a case.] (Zoöl.) The horny covering of the bill of
||birds.
Rha"phe (?), n. [NL., fr. Gr. &?;&?;&?; seam, fr. &?;&?;&?; to sew. ]
(Bot.) The continuation of the seed stalk along the side of an
anatropous ovule or seed, forming a ridge or seam. [Written also
raphe.] Gray.
||Rhaph"i*des (?), n. pl. [NL., fr. Gr. &?;&?;&?;, &?;&?;&?;, a needle,
||F. raphides.] (Bot.) Minute transparent, often needle-shaped,
||crystals found in the tissues of plants. [Written also raphides.]
Rha*pon"ti*cine (&?;), n. [L. rhaponticum rhubarb. See Rhubarb.]
(Chem.) Chrysophanic acid.
Rhap"sode (rp"sd), n. [Gr. "rapsw,do`s. See Rhapsody.] (Gr. Antiq.) A
rhapsodist. [R.] Grote.