2. (Zoöl.) One of the hard parts forming the ovipositor of insects.
Rhabdocœla
(||Rhab`do*cœ"la) 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.
Rhabdocœlous
(Rhab`do*cœ"lous) a. (Zoöl.) Of or pertaining to the Rhabdocœla.
Rhabdoidal
(Rhab*doid"al) a. See Sagittal.
Rhabdolith
(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.
Rhabdology
(Rhab*dol"o*gy) n. Same as Rabdology.
Rhabdom
(Rhab"dom) 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.
Rhabdomancy
(Rhab"do*man`cy) n. Same as Rabdomancy.
Rhabdomere
(Rhab"do*mere) n. [Rhabdom + -mere.] (Zoöl.) One of the several parts composing a
rhabdom.
Rhabdophora
(||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.
Rhabdopleura
(||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
Rhabdosphere
(Rhab"do*sphere) n. [Gr. "ra`bdos a rod + E. sphere.] A minute sphere composed of
rhabdoliths.
Rhachialgia
(||Rha`chi*al"gi*a) n. [NL.] See Rachialgia.
Rhachidian
(Rha*chid"i*an) a. Of or pertaining to the rhachis; as, the rhachidian teeth of a mollusk.
Rhachiglossa
(||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.
Rhachilla
(||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.
Rhachiodont
(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.
Rhachis
(||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.
