| ricinism | Poisoning by ingestion of toxic principles from seeds (castor beans) or leaves of the castor oil plant, Ricinus communis. (05 Mar 2000) |
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| ricinoleate | <chemistry> A salt of ricinoleic acid; formerly called palmate. Source: Websters Dictionary (01 Mar 1998) |
| ricinoleic | <chemistry> Pertaining to, or designating, a fatty acid analogous to oleic acid, obtained from castor oil as an oily substance, CHO with a harsh taste. Formerly written ricinolic. Source: Websters Dictionary (01 Mar 1998) |
| ricinoleic acid | C18H34O3; [R -Z]-12-hydroxy-9-octadecenoic acid;an unsaturated hydroxy acid present in castor oil. (05 Mar 2000) |
| ricinolein | <chemistry> The glycerin salt of ricinoleic acid, occuring as a characteristic constituent of castor oil; formerly called palmin. Origin: L. Ricinus castor-oil plant + oleum oil. Source: Websters Dictionary (01 Mar 1998) |
| ricinolic | <chemistry> Ricinoleic. Source: Websters Dictionary (01 Mar 1998) |
| ricinus | <botany> A genus of plants of the Spurge family, containing but one species (R. Communis), the castor-oil plant. The fruit is three-celled, and contains three large seeds from which castor oil iss expressed. See Palma Christi. Origin: L, the castor-oil plant. Source: Websters Dictionary (01 Mar 1998) |
| Ricinus communis agglutinin | <protein> Lectin (120 kD) from castor bean, with specificity similar to ricin, but much less toxic. (18 Nov 1997) |
| rickets | <rheumatology, orthopaedics> A condition caused by deficiency of vitamin D, especially in infancy and childhood, with disturbance of normal ossification. The disease is marked by bending and distortion of the bones under muscular action, by the formation of nodular enlargements on the ends and sides of the bones, by delayed closure of the fontanelles, pain in the muscles and sweating of the head. Vitamin D and sunlight together with an adequate diet are curative, provided that the parathyroid glands are functioning properly. Origin: Gr. Rhachitis = a spinal complaint (18 Nov 1997) |
| rickettiosis, north asian tick-borne | One of the tick-borne rickettsial diseases of the eastern hemisphere, similar to rocky mountain spotted fever, but less severe, with fever, a small ulcer (eschar) at the site of the tick bite, swollen glands nearby (satellite lymphadenopathy), and a red raised (maculopapular) rash. (12 Dec 1998) |
| Ricketts, Howard | <person> U.S. Pathologist, 1871-1910. See: Rickettsia. (05 Mar 2000) |
| rickettsia | A member of a group of microorganisms that (like viruses) require other living cells for growth but (like bacteria) use oxygen, have metabolic enzymes and cell walls, and are susceptible to antibiotics. Rickettsiae cause a series of diseases (see rickettsial diseases). (12 Dec 1998) |
| Rickettsia akari | A species causing human rickettsialpox; transmitted by the house mouse mite, Liponyssoides sanguineus; a mild febrile disease of 7 to 10 days is produced with an urban distribution in the northeastern U.S. And in wild or commensal rodents in the countries of the former USSR and Africa. (05 Mar 2000) |
| Rickettsia australis | A species causing a spotted fever, North Queensland tick typhus, clinically and serologically similar to the disease caused by the agent of rickettsialpox; Ixodes holocyclus and I. Tasmani are probable vectors. Small marsupials are suspected reservoirs of this agent, which is found over much of coastal Queensland, especially in secondary scrub and savannah. (05 Mar 2000) |
| Rickettsia burnetii | Former name for Coxiella burnetii. (05 Mar 2000) |