| derivative | A chemical substance derived from another substance either directly or by modification or partial substitution. (18 Nov 1997) |
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| derivative chromosome | An anomalous chromosome generated by translocation. Synonym: translocation chromosome. (05 Mar 2000) |
| haematoporphyrin derivative | <chemical> A complex mixture of monomeric and aggregated porphyrins used in the photodynamic therapy of tumours (haematoporphyrin photoradiation). A purified component of this mixture is known as dihematoporphyrin ether. Pharmacological action: antineoplastic agent, photosensitizing agents. Chemical name: Haematoporphyrin D (12 Dec 1998) |
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| purified protein derivative of tuberculin | Purified tuberculin containing the active protein fraction; the tuberculin from which it is prepared differs from tuberculin chiefly in that the bacteria are grown in a synthetic rather than in a broth medium. (05 Mar 2000) |