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Rhachidian
a.
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Of or pertaining to the rhachis; as, the rhachidian teeth of a mollusk.
Rhachiglossa
n. pl.
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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.
Rhachilla
n.
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A branch of inflorescence; the zigzag axis on which the florets are arranged in the spikelets of grasses.
Rhachiodont
a.
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Having gular teeth formed by a peculiar modification of the inferior spines of some of the vertebrae, as certain South African snakes (Dasypeltis) which swallow birds' eggs and use these gular teeth to crush them.
Rhachises
pl.
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of Rhachis
Rhachides
pl.
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of Rhachis
Rhachis
n.
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The spine.
Rhachis
n.
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The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern.
Rhachis
n.
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The principal axis in a raceme, spike, panicle, or corymb.
Rhachis
n.
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The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.
Rhachis
n.
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The central cord in the stem of a crinoid.
Rhachis
n.
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The median part of the radula of a mollusk.
Rhachis
n.
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A central cord of the ovary of nematodes.
Rhachitis
n.
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See Rachitis.
Rhadamanthine
a.
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Of or pertaining to Rhadamanthus; rigorously just; as, a Rhadamanthine judgment.
Rhadamanthus
n.
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One of the three judges of the infernal regions; figuratively, a strictly just judge.
Rh/tian
a & n.
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Rhetain.
Rh/tic
a.
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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.
Rh/tizite
n.
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A variety of the mineral cyanite.
Rhamadan
n.
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See Ramadan.
Rhamnaceous
a.
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Of or pertaining to a natural order of shrubs and trees (Rhamnaceae, or Rhamneae) 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).
Rhamnus
n.
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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.
Rhamphorhynchus
n.
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A genus of pterodactyls in which the elongated tail supported a leathery expansion at the tip.
Rhamphothecae
pl.
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of Rhamphotheca
Rhamphotheca
n.
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The horny covering of the bill of birds.
Rhaphe
n.
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The continuation of the seed stalk along the side of an anatropous ovule or seed, forming a ridge or seam.
Rhaphides
n. pl.
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Minute transparent, often needle-shaped, crystals found in the tissues of plants.
Rhaponticine
n.
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Chrysophanic acid.
Rhapsode
n.
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A rhapsodist.
Rhapsoder
n.
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A rhapsodist.