瑜伽師地論略纂 2.62

2.62

In explaining the names: the eye (cakṣus) is called cakṣu in Sanskrit. Cak means to move; ṣu means to exhaust. It means capable of moving exhaustively across objects and seeing exhaustively; seeing all forms exhaustively, it is called moving exhaustively. Now calling it eye is because its entity and meaning correspond. The ear (śrotra) is called śruta (pronounced shūlù) in Sanskrit, which means capable of hearing, the "hearing" of "Thus have I heard". Calling it ear is because its entity and meaning correspond. In the tongue, being able to eliminate hunger and thirst belongs precisely to the tongue faculty. Producing speech and debate belongs to the support-locus of the tongue, which conventional usage names the tongue, so it is taken as its name.