from
The Collaborative International Dictionary of English v.0.48
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]