Definition of: silo

(sī′lō) noun plural ·los
1. A structure, usually of wood or concrete, as a cylindrical pit or a tower, in which fodder, grain, or other food is stored green to be fermented and used as feed for cattle, etc. See ENSILAGE.
2. A deep cylindrical structure built underground for the housing and launching of guided missiles.
—v.t. ·loed, ·lo·ing To put or preserve in a silo; turn into ensilage. [<Sp. <L sirus <Gk. siros pit for corn]
SILO
Stave type, showing interior construction and pit.