1560s, from Latin granaria (plural) "granary, store-house for grain," from granum "grain," from PIE root *gre-no- "grain."
Entries linking to granary
*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.