The Collaborative International Dictionary of English v.0.48:

Silo \Si"lo\, n. [F.]
   A pit or vat for packing away green fodder for winter use so
   as to exclude air and outside moisture. See Ensilage.
   [1913 Webster]

WordNet (r) 3.0 (2006):

silo
    n 1: a cylindrical tower used for storing silage
    2: military installation consisting of an underground structure
       where ballistic missiles can be stored and fired

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "silo":
   Mark, bazooka, calliope, crib, elevator, garner, grain bin,
   grain elevator, granary, hayloft, haymow, hayrick, hedgehog,
   launch pad, launching pad, launching platform, launching tube,
   mousetrap, mow, projector



The Jargon File (version 4.4.7, 29 Dec 2003):

silo
 n.

    The FIFO input-character buffer in an RS-232 line card. So called from DEC
     terminology used on DH and DZ line cards for the VAX and PDP-11,
    presumably because it was a storage space for fungible stuff that went in
    at the top and came out at the bottom.


The Free On-line Dictionary of Computing (30 December 2018):

silo

   The FIFO input-character buffer in an EIA-232 serial line
   card.  So called from DEC terminology used on DH and DZ line
   cards for the VAX and PDP-11, presumably because it was a
   storage space for fungible stuff that went in at the top and
   came out at the bottom.


U.S. Gazetteer Places (2000):

Silo, OK -- U.S. town in Oklahoma
   Population (2000):    282
   Housing Units (2000): 114
   Land area (2000):     0.520196 sq. miles (1.347302 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.520196 sq. miles (1.347302 sq. km)
   FIPS code:            67550
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.037219 N, 96.475645 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Silo, OK
    Silo