a verbal noun of فَرَّ. (S, M, K. [See the first and second sentences of this article])
2.
Also A time [and a place] of fleeing: (TA:) and ↓مَفِرُّ signifies a place of fleeing: (I'Ab, Zj, S, M, TA:) and so does ↓مِفَرُّ; (Zj, K, TA,) an instrumental noun used as a noun of place. (K, TA.) [See 1, second sentence.]