Hypertext Webster Gateway: "phthalide"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Phthalide \Phthal"ide\, n. [Phthalyl + anhydride.] (Chem.)
A lactone obtained by reduction of phthalyl chloride, as a
white crystalline substance; hence, by extension, any one of
the series of which phthalide proper is the type. [Written
also {phthalid}.]
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