Word Origin & History
silo1835, from Sp. silo, from L. sirum (nom. sirus), from Gk. siros "a pit to keep corn in." Or, alternately, the Sp. 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"
EXPANDis attested from 1958.
COLLAPSE