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.

1825–35; < Spanish: place for storing grain, hay, etc., orig. subterranean; ulterior origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
silo (ˈsaɪləʊ)
n , pl -los
1.  a pit, trench, horizontal container, or tower, often cylindrical in shape, in which silage is made and stored
2.  a strengthened underground position in which missile systems are sited for protection against attack
[C19: from Spanish, perhaps from Celtic]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1835, 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"
is attested from 1958.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
From grain silos to abandoned hospitals, this gallery of short, stylish videos
  takes you on some surprising urban adventures.
Newly built versions come complete with porches, silos and turrets.
Above the silos are rectangular storage containers containing gray ash to
  protect them from pests.
In certain areas, you can measure distances by counting the silos.
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