مَنْهَرٌ

The place of a river. (T, TA.)

A place which the water hollows out in a نَهْر [or channel of a river]. (K.)

A cleft, (K, TA,) or hole, (TA,) in a fortress, passing through [the wall], whence water runs. (K, TA,) or by which water enters: (TA:) plural مَنَاهِرُ. (TA.)