Plural or variant form relating to small locks, latches, or bar mechanisms in architecture or ancient construction.
From Greek 'kleithridion' (small lock/latch) with Latinized plural. Rare architectural terminology.
Ancient Greek and Roman builders had to describe ingenious lock mechanisms that could seal tombs, treasure vaults, and temples—clitia were likely their technical term for these clever contraptions that kept invaluable things protected.
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