佛陀毗耶長老（又名 Dīpaṅkara）所著的一部巴利語語法書，大體依據迦旃延語法而作，全名為 Padarūpasiddhi，另有一部據說出自佛陀毗耶本人之手的復注。

A Pali grammar by the elder Buddhappiya, also known as Dīpaṅkara, based in outline on Kaccāyana’s grammar and fully titled the Padarūpasiddhi, with a subcommentary attributed to Buddhappiya himself.