مِدْفَعٌ
1.
See دَفُوعٌ.
2.
[Its primary signification is An instrument for impelling, propelling, or repelling: and hence it is applied in modern Arabic to a cannon: and to an instrument used by midwives for protruding the fœtus.
3.
Hence, also, it is used as an intensive epithet: and hence,] رُكْنٌ مِدْفَعٌ
A strong corner. (TA.)