preg·na·ble \ˈpregnəbəl\adjective Etymology: alteration (influenced by pregnant) of earlier preignable, alteration (influenced by such words as reign, deign, with silent g) of Middle English prenable, from Middle French — more at impregnable 1.: vulnerable to capture : expugnable < a pregnable fort > 2.[pregnate + -able]: capable of being impregnated < a pregnable cat >