Being such that attack, seizure, or capture is possible; vulnerable or assailable.
A pregnable fortress.
That can be captured, as a fortress.
That can be attacked or injured; assailable or vulnerable.
Origin of pregnable
- Middle English preignable, pregnabul from Old French prenable, pregnauble from prendre to grasp from Latin prehendere, prēndere ghend- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition