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Being such that attack, seizure, or capture is possible; vulnerable or assailable: a pregnable fortress.
[Middle English preignable, pregnabul, from Old French prenable, pregnauble, from prendre, to grasp, from Latin prehendere, prēndere; see ghend- in Indo-European roots.]
capable of being assailed or captured
[C15 prenable, from Old French prendre to take, from Latin prehendere to lay hold of, catch]
preg•na•ble(ˈprɛg nə bəl)
1. capable of being taken by force: a pregnable fortress.
2. open to rebuttal: a pregnable argument.
[1400–50; late Middle English prenable < Middle French pre(g)nable]