- silo (n.)
- 1835, from Spanish silo, from Latin sirum (nominative sirus), from Greek siros "a pit to keep corn in." Or, alternately, the Spanish word is from a pre-Roman Iberian language word represented by Basque zilo, zulo "dugout, cave or shelter for keeping grain." Meaning "underground housing and launch tube for a guided missile" is attested from 1958.