| dihematoporphyrin ether | <chemical> The purified component of haematoporphyrin derivative, it consists of a mixture of oligomeric porphyrins. It is used in photodynamic therapy (haematoporphyrin photoradiation) to treat malignant lesions with visible light and experimentally as an antiviral agent. It is the first drug to be approved in the use of photodynamic therapy in the united states. Pharmacological action: antineoplastic agent, antiviral agents, dermatologic agents. Chemical name: 21H,23H-Porphine-2,18-dipropanoic acid, 7-(1-(1-(8,12-bis(2-carboxyethyl)-17-(1-hydroxyethyl)-3,7,13,18-tetramethyl-21H,23H-porphin-2-yl)ethoxy)ethyl)-12-(1-hydroxyethyl)-3,8,13,17-tetramethyl- (12 Dec 1998) |
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| diheterozygote | An individual heterozygous at two loci of interest, especially in genetic linkage analysis. (05 Mar 2000) |
| dihexagonal | Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base. Having twelve similar faces; as, a dihexagonal prism. Origin: Pref. Di- + hexagonal. Source: Websters Dictionary (01 Mar 1998) |