| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
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| RBD | recurrent brief depression; relative biological dose; right border of dullness |
| RCDA | recurrent chronic dissecting aneurysm |
| rec | fresh [Lat. recens]; recessive; recombinant chromosome; record; recovery; recurrence, recurrent |
| recur | recurrence, recurrent |
one and one-half syndrome
| secondary carcinoma | <tumour> A carcinoma that has appeared in a region remote from its site of origin, as in metastasis. Synonym: secondary carcinoma. (05 Mar 2000) |
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| secondary cardiomyopathy | Disease that affects the myocardium secondarily to systemic disease, infection, or metabolic disease. (05 Mar 2000) |
| secondary caries | Caries of enamel beginning at the dento-enamel junction due to a rapid lateral spread of decay from the original decay. (05 Mar 2000) |
| secondary cataract | A cataract that accompanies or follows some other eye disease such as uveitis. Synonym: complicated cataract. A cataract occurring in the retained lens or capsule after a cataract extraction. Synonym: aftercataract. (05 Mar 2000) |
| secondary cementum | Cementum that forms on the root surface after eruption; it contains cementocytes. (05 Mar 2000) |
| secondary centre of ossification | This is the centre of bone formation appearing later than the punctum ossificationis primarium, usually in epiphysis. Synonym: punctum ossificationis secundarium, secondary point of ossification. (05 Mar 2000) |
| secondary choana | The definitive choana opening into the nasopharynx, after the nasal chambers have been lengthened by the formation of the secondary palate. Synonym: internal nostril. (05 Mar 2000) |
| secondary coccidioidomycosis | Progressive or disseminated extrapulmonary granulomatous lesions following primary coccidioidomycosis. Synonym: coccidioidal granuloma. (05 Mar 2000) |
| secondary constriction | A subsidiary narrowing of the chromosome associated in some cases with satellites. (05 Mar 2000) |
| secondary degeneration | <medicine> A form of degeneration occurring in nerve fibres as a result of their division; so called from Dr. Waller, who published an account of it in 1850. Source: Websters Dictionary (01 Mar 1998) |
| secondary dementia | Chronic dementia following and due to a psychosis or some other underlying disease process. Senile dementia, dementia of Alzheimer's disease developing after age 65. Toxic dementia, dementia caused by an exogenous agent. (05 Mar 2000) |
| secondary dentin | Dentin formed by normal pulp function after root end formation is complete. (05 Mar 2000) |
| secondary dentition | One of the 32 teeth belonging to the second or permanent dentition; eruption of the permanent teeth begins from the fifth to the seventh year, and is not completed until the seventeenth to the twenty-third year, when the last of the wisdom teeth appears. Synonym: dens permanens, dens succedaneus, second tooth, secondary dentition, succedaneous dentition, succedaneous tooth. (05 Mar 2000) |
| secondary deviation | Ocular deviation seen in paralysis of an ocular muscle when the paralysed eye is used for fixation. (05 Mar 2000) |
| secondary dextrocardia | Dextroposition of the heart by some disease of the lungs, pleura, or diaphragm. Synonym: type 4 dextrocardia. (05 Mar 2000) |