مَدْفَعٌ

[A channel of water;] one of the مَدَافِع of waters, in which the waters run: (S, K:) [مَدَافِعُ being its plural:] the lower, or lowest, part of a valley, where the torrent pours forth, and its water disperses: (ISh:) and the [water-course, or channel, such as is called] مِذْنَب of a دَافِعَة [q. v.]; because this latter pours forth therein to another دافعة; (K, TA;) the مذنب being the channel between the دَافِعَتَانِ. (TA.)