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[sahy-loh] /ˈsaɪ loʊ/
noun, plural silos.
a structure, typically cylindrical, in which fodder or forage is kept.
a pit or underground space for storing grain, green feeds, etc.
Military. an underground installation constructed of concrete and steel, designed to house a ballistic missile and the equipment for firing it.
verb (used with object), siloed, siloing.
to put into or preserve in a silo.
Origin of silo
1825-35; < Spanish: place for storing grain, hay, etc., orig. subterranean; ulterior origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for siloing


noun (pl) -los
a pit, trench, horizontal container, or tower, often cylindrical in shape, in which silage is made and stored
a strengthened underground position in which missile systems are sited for protection against attack
Word Origin
C19: from Spanish, perhaps from Celtic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for siloing



1835, from Spanish silo, traditionally derived from Latin sirum (nominative sirus), from Greek siros "a pit to keep corn in." "The change from r to l in Spanish is abnormal and Greek siros was a rare foreign term peculiar to regions of Asia Minor and not likely to emerge in Castilian Spain" [Barnhart]. Alternatively, 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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