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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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