A branch drain accepting waste products delivered to it vertically, by gravity, from one or more similar but usually smaller fixtures, and conducting them horizontally to the primary disposal drain.
But this preliminary document is the clearest indication of the Pentagon's thinking about the future of nuclear missiles. In short, the Pentagon plans to replace the Minuteman III ICBM with a new launch rocket, one that would launch from the same silos in Montana and South Dakota where the missiles sit now. However, a new missile does not mean a new warhead.
noun, plural silos. 1. a structure, typically cylindrical, in which fodder or forage is kept. 2. a pit or underground space for storing grain, green feeds, etc. 3. Military. an underground installation constructed of concrete and steel, designed to house a ballistic missile and the equipment for firing it.