A large blister or fluid-filled bubble on the skin; in architecture or ancient Rome, a rounded or bulging ornament or seal.
From Latin 'bulla' meaning bubble or rounded object, related to 'bullae' (plural). The word entered English via medical and architectural terminology.
The Latin 'bulla' was both an everyday object (a bubble) and a symbol of power—Roman children wore a 'bulla' (an ornamental pendant) as a mark of status, so the same word described something trivial and something ceremonial!
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