BT BB 6a(34) :אחזיק לנטפי לא אחזיק לש^פכ^י 7102201006135 לשפכי אחזיק לנטפי‏ : (if ) he had a prescriptive right for dripping rain water, he had a prescriptive right for gutters. (If he had a prescriptive right) for gutters he did not have a prescriptive right for dripping rain water
See the entire entry for nāṭp̄īn, nāṭp̄ē n.m.pl.t. dripping rain