01 n. A tower or an elevated work, used for the defense, or in the siege, of a fortified place.
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1.
A tower or an elevated work, used for the defense, or in the siege, of a fortified place.(Feud. Fort.)“The high bastiles . . . which overtopped the walls.” — Holland.
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2.
“The Bastille”, formerly a castle or fortress in Paris, used as a prison, especially for political offenders; hence, a rhetorical name for a prison.