佛陀毗耶长老（又名 Dīpaṅkara）所著的一部巴利语语法书，大体依据迦旃延语法而作，全名为 Padarūpasiddhi，另有一部据说出自佛陀毗耶本人之手的复注。

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.