Webster's Revised Unabridged Dictionary · 1913

Phthalimide

Phthalimide , noun

[Phthalic + imide.]

(Chemistry) 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. Compare Imido acid, under Imido.