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impregnable
1430,
imprenable,
from M.Fr.
imprenable,
from O.Fr.
in-
"not" +
prenable
"assailable, vulnerable," from stem of
prendre
"to take, grasp," from L.
prehendere
(see
prehensile
). With intrusive
-g-
16c., on model of
deign, reign,
etc.
