Phthal·i·mide n.  Chem. An imido derivative of phthalic acid, obtained as a white crystalline substance, C6H4.(CO)2NH, which has itself (like succinimide) acid properties, and forms a series of salts.  Cf. Imido acid, under Imido.

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 Suc·cin·im·ide n. Chem. A white crystalline nitrogenous substance, C2H4.(CO)2.NH, obtained by treating succinic anhydride with ammonia gas. It is a typical imido acid, and forms a series of salts. See Imido acid, under Imido.

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 Im·i·do a. Chem. Pertaining to, containing, or combined with, the radical NH, which is called the imido group.
 Imido acid, an organic acid, consisting of one or more acid radicals so united with the imido group that it contains replaceable acid hydrogen, and plays the part of an acid; as, uric acid, succinimide, etc., are imido acids.

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