Etymology
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garner (n.)
"a granary," late 12c., gerner, from Old French gernier, metathesized variant of grenier "storehouse, loft for grain," from Latin granarium (usually plural, granaria) "store-house for grain," from granum "grain," from PIE root *gre-no- "grain."
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garner (v.)
late 15c., "to store grain," from garner (n.). Related: Garnered; garnering.
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*gre-no- 
*grə-no-, Proto-Indo-European root meaning "grain."

It forms all or part of: corn (n.1); filigree; garner; garnet; grain; granary; grange; granger; granite; granular; granule; grenade; grenadine; kernel; pomegranate.

It is the hypothetical source of/evidence for its existence is provided by: Latin granum "seed," Old Church Slavonic zruno "grain," Lithuanian žirnis "pea," Old English corn.
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