noun
Etymology: boom (II)
1. : a derrick mounted on a caterpillar tractor
2. : one who operates a power shovel at a strip mine to remove overlying ground and load coal into cars
noun
Etymology: boom (II)
1. : a derrick mounted on a caterpillar tractor
2. : one who operates a power shovel at a strip mine to remove overlying ground and load coal into cars
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012