| definitive callus | The callus which has become converted into osseous tissue. Synonym: permanent callus. (05 Mar 2000) |
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| definitive erythroblast | <haematology, pathology> Embryonic erythroblast found in the liver, smaller than primitive erythroblasts, they lose their nucleus at the end of the maturation cycle and produce erythrocytes with adult haemoglobin. (18 Nov 1997) |
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| definitive host | <epidemiology> The host in which a parasite reproduces sexually. (05 Dec 1998) |
| definitive lysosomes | Lysosome's in which lysis takes place, owing to the activity of hydrolytic enzymes; they are believed to eventually become residual bodies. Synonym: definitive lysosomes, digestive vacuole. (05 Mar 2000) |
| definitive method | An analytical procedure for the measurement of a specified analyte in a specified material which is known to give essentially the true value for the concentration of the analyte. (05 Mar 2000) |
| definitive prosthesis | A dental prosthesis to be used over a prescribed period of time. (05 Mar 2000) |
| callus | 1. <botany> Undifferentiated plant tissue produced at wound edge callus tissue can be grown in vitro and induced to differentiate by varying the ratio of the hormones auxin and cytokinin in the medium. 2. <pathology> Mass of new bony trabeculae and cartilaginous tissue formed by osteoblasts early in the healing of a bone fracture. (18 Nov 1997) |
| central callus | The callus within the medullary cavity of a fractured bone. Synonym: medullary callus. (05 Mar 2000) |
| medullary callus | The callus within the medullary cavity of a fractured bone. Synonym: medullary callus. (05 Mar 2000) |
| permanent callus | The callus which has become converted into osseous tissue. Synonym: permanent callus. (05 Mar 2000) |
| provisional callus | The callus that develops to keep the ends of the fractured bone in apposition; it is absorbed after union is complete. Synonym: temporary callus. (05 Mar 2000) |
| temporary callus | The callus that develops to keep the ends of the fractured bone in apposition; it is absorbed after union is complete. Synonym: temporary callus. (05 Mar 2000) |
| ensheathing callus | The mass of callus around the outside of the fractured bone. (05 Mar 2000) |