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

(||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.

  By PanEris using Melati.

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