Ezroa is a variant form of zeroa (H2220), meaning arm or forearm. It denotes the human arm as a symbol of strength, power, and action. Used poetically in Job to describe physical might and in contexts of warfare or labor requiring strength.
The arm in Hebrew thought is the embodiment of active power — the instrument by which strength is expressed. When Scripture speaks of God's "arm," it points to His mighty acts of salvation (Isaiah 52:10). The human arm, by contrast, is limited and mortal, which is why trusting in the "arm of flesh" is condemned as unfaith (2 Chronicles 32:8).