| rhabdopleura | <zoology> 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 Origin: NL, fr. Gr. "rabdos a rod + the side. Source: Websters Dictionary (01 Mar 1998) |
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| rhabdosarcoma | <oncology, tumour> A very dangerous cancer which develops from striated muscle tissue. Thereare three major forms: 1. Alveolar rhabdosarcoma: this cancer, which most often afflicts adolescents, typically develops in the extremities, body or eye cavities. 2. Embryonal rhabdosarcoma: this cancer, which strikes infants and young children, develops in the head, neck, extremities or lower genitourinary tract. 3. Pleiomorphic rhabdosarcoma: this cancer strikes adults and typically develops in the extremities. (09 Oct 1997) |
| rhabdosphincter | A sphincter made up of striated musculature. Synonym: striated muscular sphincter. Origin: rhabdo-+ G. Sphinkter, sphincter (05 Mar 2000) |
| Rhabdoviridae | <virology> Class V viruses with a single negative strand RNA genome and an associated virus specific RNA polymerase. The capsid is bullet shaped and enveloped by a membrane that is formed when the virus buds out of the plasma membrane of infected cells. The budded membrane contains host lipids but only glycoproteins coded for by the virus, of which there are usually 1-3 species. In the electron microscope these appear as regularly arranged spikes about 10nm long and are called spike glycoproteins. This group includes rabies virus, vesicular stomatitis virus and a number of plant viruses. (11 Jan 1998) |
| rhabdoviridae infections | Virus diseases caused by rhabdoviridae. Important infections include rabies, ephemeral fever, and vesicular stomatitis. (12 Dec 1998) |
| rhabdovirus | Any virus of the family Rhabdoviridae. (05 Mar 2000) |
| rhachi- | For words so beginning, see rachi-. (05 Mar 2000) |
| rhachiglossa | <zoology> 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. Origin: NL. See Rhachis, and Glossa. Source: Websters Dictionary (01 Mar 1998) |
| rhachilla | <botany> A branch of inflorescence; the zigzag axis on which the florets are arranged in the spikelets of grasses. Origin: NL, fr. Gr. "rachis the spine. Source: Websters Dictionary (01 Mar 1998) |
| rhachiodont | <zoology> Having gular teeth formed by a peculiar modification of the inferior spines of some of the vertebrae, as certain South African snakes (Dasypelits) which swallow birds' eggs and use these gular teeth to crush them. Origin: Gr. "rachis, -ios, the spine +, a tooth. Source: Websters Dictionary (01 Mar 1998) |
| rhachis | Origin: See Rachis Alternative forms: rechis. 1. <anatomy> The spine. 2. <botany> The continued stem or midrib of a pinnately compound leaf, as in a rose leaf or a fern. The principal axis in a raceme, spike, panicle, or corymb. 3. <zoology> The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis. The central cord in the stem of a crinoid. The median part of the radula of a mollusk. A central cord of the ovary of nematodes. Source: Websters Dictionary (01 Mar 1998) |
| rhadinovirus | A genus of the family herpesviridae, subfamily gammaherpesvirinae, infecting new world primates. Herpes virus 2, ateline is the type species. (12 Dec 1998) |
| rhagades | <dermatology> Fissures, cracks or fine linear scars in the skin, especially such lesions around the mouth or other regions subjected to frequent movement. Origin: pl. Of Gr. Rhagas = rent (18 Nov 1997) |
| rhagadiform | Resembling or characterised by rhagades. Origin: G. Rhagas (rhagad-), crack, + L. Forma, shape (05 Mar 2000) |
| rhagamanthus | One of the three judges of the internal regions; figuratively, a strictly just judge. Origin: L, fr. Gr. Source: Websters Dictionary (01 Mar 1998) |