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impregnable
From The Collaborative International Dictionary of English v.0.48:
Impregnable \Im*preg"na*ble\, a. [F. imprenable; pref. im- not + prenable pregnable, fr. prendre to take, L. prehendere. See Comprehend, Get to obtain.] Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue. [1913 Webster] The man's affection remains wholly unconcerned and impregnable. --South. -- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Impregnable \Im*preg"na*ble\, a. [See Impregnate.] (Biol.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant. [1913 Webster]
