| secondary sex characters | Those character's peculiar to the male or female that develop at puberty, e.g., the beard of men and the breasts of women. (05 Mar 2000) |
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| secondary site | A second site in which cancer is found. Example: cancer in the lymph nodes near the breast is a secondary site. (09 Oct 1997) |
| secondary spiral lamina | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary spiral plate | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary structure | <molecular biology> Structures produced in polypeptide chains involving interactions between amino acids within the chain. Especially _ helical and _ pleated sheet structures. Also applies to the complex folding of nucleic acids as, for example: the clover leaf structure of tRNA. (18 Nov 1997) |
| secondary succession | The progression of plant communities following disturbances such as fire, windthrow and timber harvesting. See Succession. (05 Dec 1998) |
| secondary suture | Delayed closure of a wound. (05 Mar 2000) |
| secondary syphilid | A syphilitic skin lesion characteristic of the second stage of the disease. (05 Mar 2000) |
| secondary syphilis | The second stage of syphilis See: syphilis. Synonym: mesosyphilis. (05 Mar 2000) |
| secondary teeth | <dentistry> The permanent teeth, i.e. The second group of teeth to come in. (08 Jan 1998) |
| secondary telangiectasia | Telangiectasia related to a known cause of prolonged dermal vascular dilatation such as sunlight, varicose veins, and connective tissue diseases; often associated with atrophy of the skin. (05 Mar 2000) |
| secondary thrombus | A thrombus formed about an embolus as a nucleus. (05 Mar 2000) |
| secondary tuberculosis | Tuberculosis found in adults and characterised by lesions near the apex of an upper lobe, which may cavitate or heal with scarring without spreading to lymph nodes; theoretically, secondary tuberculosis may be due to exogenous reinfection or to reactivation of a dormant endogenous infection. Synonym: adult tuberculosis, postprimary tuberculosis, reinfection tuberculosis. (05 Mar 2000) |
| secondary tumour | <oncology> A tumour that develops as a result of metastasis or spreads beyond the original cancer. (09 Oct 1997) |
| secondary tympanic membrane | The membrane closing the fenestra cochleae or rotunda. Synonym: membrana tympani secundaria, Scarpa's membrane. (05 Mar 2000) |