مَرْبَاءٌ

, (M, and so in copies of the K,) according to IAar, with medd and fet-h, (M,) or ↓ مِرْبَاءٌ, (M, and so in the K according to the TA,) the latter preferred by Th, (M,) A stair, or ladder. (IAar, M, K.)