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.
When the Minuteman III retires, the silos and launch facilities at Malmstrom Air Force Base in Montana, which oversees 150 nuclear ICBMs scattered across a 13,800 square miles, will have been buried for 70 years.
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.