| EMBASE | Excerpta Medica Database |
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| materia medica | 1. Material or substance used in the composition of remedies; a general term for all substances used as curative agents in medicine. 2. That branch of medical science which treats of the nature and properties of all the substances that are employed for the cure of diseases. Origin: L. See Matter, and Medical. Source: Websters Dictionary (01 Mar 1998) |
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| Placido da Costa, Antonio | <person> Portuguese ophthalmologist, 1848-1916. See: Placido da Costa's disk. (05 Mar 2000) |
| Placido da Costa's disk | <instrument> An instrument marked with lines or circles by means of which the corneal reflex can be observed. Synonym: Placido da Costa's disk. Origin: kerato-+ G. Skopeo, to examine (05 Mar 2000) |
| costa | <microbiology> Rod shaped intracellular organelle lying below the undulating membrane of Trichomonas. Generates active bending associated with local loss of birefringence at the bending zone, probably as a result of conformational change in the longitudinal lamellae. Major protein approximately 90 kD. (10 Nov 1998) |
| costa cervicalis | A rib which arises from the seventh cervical vertebrae (above the normal first rib). Occurs in only about 0.5% of people. May cause nerve and artery problems. (12 Dec 1998) |
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