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.
Rhachitis
(||Rha*chi"tis) n. [NL.] See Rachitis.
Rhadamanthine
(Rhad`a*man"thine) a. Of or pertaining to Rhadamanthus; rigorously just; as, a Rhadamanthine
judgment.
Rhadamanthus
(Rhad`a*man"thus) n. [L., fr. Gr. .] (Greek Mythol.) One of the three judges of the
infernal regions; figuratively, a strictly just judge.
Rhætian
(Rhæ"ti*an) a & n. Rhetain.
Rhætic
(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.
Rhætizite
(Rhæ"ti*zite) n. [So called from L. Rhaetia, Raetia, the Rhetian Alps, where it is found.] (Min.)
A variety of the mineral cyanite.
Rhamadan
(||Rham`a*dan") n. See Ramadan.
Rhamnaceous
(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
Rhamnus
(||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.
