a tall tower on a farm used for storing grain, etc. 筒倉 
In modern mills, grain is stored in silos which are often separate from the mill. 在現代磨坊中，谷物儲存在筒倉中，筒倉通常與磨坊分開。 The grass is cut for hay, then some of it is stored in silos. 草被割成幹草，然後一部分儲存在筒倉裏。
an underground place where nuclear weapons or dangerous substances are kept （核武器的）發射井；（危險物品的）地下貯藏庫 It is believed there are missile silos located in the desert. 據信沙漠中有導彈發射井。
an underground place where silage is made and stored 青貯窖 a system, process, department, etc. that operates separately or is thought of as separate from others 獨立運行的系統（或流程、部門等） Some departments have become silos and no longer communicate regularly with one another. 一些部門已各自爲政，不再定期相互溝通。 In some countries, the economy and foreign policy are considered in separate silos. 在一些國家，經濟和外交政策被視爲相互獨立的範疇。
Word Originmid 19th cent.: from Spanish, via Latin from Greek siros ‘corn pit’.