1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Phthalide \Phthal"ide\, n. [Phthalyl + anhydride.] (Chem.) A lactone ({C8H6O2}) obtained as a white crystalline substance by reduction of phthalyl chloride and other processes; hence, by extension, any one of the series of which phthalide proper is the type. [Written also {phthalid}.] [1913 Webster] Note: [PJC] 2. Specifically: A fungicide ({C8H2Cl4O2}) which is a tetrachloro derivative of phthalide[1] proper; in this sense, the spelling {fthalide} is also used. It has CAS Registry Number 27355-22-2. Syn: Syn. 4,5,6,7-tetrachloro-1(3H)-isobenzofuranone; -- . [PJC]
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