Plural of annexe or annex; multiple buildings, additions, or supplements attached to a main structure or organization.
From annexe/annex plus the regular English plural '-es', from Latin 'annexus' (attached) via Old French and modern Romance languages.
The British Museum's annexes are so vast that millions of artifacts never go on display—it's estimated that 99% of major museum collections remain hidden from public view in storage annexes.
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